Question 1

What is the filtration performance of Ultimate Star Filter® gravity filters?

Accepted Answer

We have specialised in drinking water filtration for several years, with a particular focus on gravity-based filtration. Our experience and in-depth knowledge of filtration technology have led us to design and manufacture a filter that is truly effective, tested, easy to use and easy to maintain. You can find out more about  the history of the Ultimate Star Filter®  on this page. 
 Based on scientific data and an assessment of water pollution in Europe, we have focused our efforts on filtering pollutants that pose a risk to human health. Discover the  performance of the Ultimate Star Filter®  and its unique features. 
 We have classified the main water pollutants into several categories. 
  
    
 
 
 
  Categories of polluants  
 
 
 
 
 Microbiology 
 Heavy metals 
 
 
 Pesticides / Herbicides 
 Heavy and light solvents 
 
 
 Chlorine and derivatives 
 Medicinal residues 
 
 
 PFAS 
 Plastic derivatives 
 
 
 Hormones 
 Microplastics 
 
 
 
  
 Our  Ultimate Star Filter®  has been tested on 3,200 litres, exceeding  the theoretical lifespan  of 3,000 litres (6,000 litres for a pair)  with exceptional results . 
  
 You will find all the information about the tests carried out on  the analysis results page . 
 Our Ultimate Star Filter® complies with  European REACH regulations  and is  NSF® certified .

Question 2

What is the composition of the Ultimate Star Filter® water filter?

Accepted Answer

Without revealing our manufacturing secrets, and unlike most carbon filters sold under different brand names and composed solely of activated carbon, our filter is a complex assembly of several elements. Our composite filter provides effective filtration of most of the potentially dangerous pollutants present in water. 
 The filter is moulded from very high quality activated carbons,  all NSF certified® , it contains silver ions for their bacteriostatic properties, as well as a specific material that improves the adsorption of heavy metals, also NSF certified. Finally, it incorporates a special nanofiltration membrane that works in conjunction with the other processes to treat a wide range of pollutants, including bacteria and viruses. This material was originally developed by NASA to solve the problem of water filtration in spacecraft. It tracks down the smallest molecules, right down to viruses, and its characteristics enable it to filter particles down to 0.001 micrometers (nanofiltration). This component is also NSF® certified. 
 Other parts of the filter 
 
  The plastic parts of  the filter are made from food-grade polypropylene, free from BPA and phtalates. This plastic has been assessed by an independent laboratory and has passed the REACH and ROHS (Restriction of Hazardous Substances) assessment aimed at limiting the use of ten hazardous substances: Lead, Mercury, Cadmium, Hexavalent Chromium, Polybrominated Biphenyls (PBB), Polybrominated Diphenyl Ethers (PBDE), Bis(2-ethylhexyl) phtalate (DEHP), Butylbenzyl phthalate (BBP), Dibutyl phtalate (DBP) and Diisobutyl phthalate (DIBP). 
  The silicone  used in the joints is food-grade, and has passed REACH and ROHS assessments. 
  The glue  used to assemble the different parts of the filter is food-grade, and has also passed REACH and ROHS assessments. 
 
  
 Our  Ultimate Star Filter®  has successfully passed  the REACH assessment  and is  NSF® certified .  We can therefore guarantee flawless efficiency and safety of use.

Question 3

What is the lifespan of an Ultimate Star Filter®?

Accepted Answer

The lifespan of a gravity water filter cannot be reduced to a single “magic” number. At Star Water Filter®, the reference is a  recommended lifespan  designed to preserve  consistent water quality  and  predictable performance  under varied usage conditions. 
 
 
 Key points (quick read) 
 
  Recommended lifespan:   3,000 L per filter  (i.e.,  6,000 L  for a pair). 
 This threshold is  prudent : it is  not  a sudden “physical limit.” 
 Actual lifespan depends primarily on the  quality of the treated water  and  usage conditions . 
 A filter  saturates progressively :  flow rate  often decreases before any other noticeable change. 
 Replacement aims to maintain  reliable filtration  over time, not to wait for “complete exhaustion.” 
 
 To understand the mechanism (saturation, flow rate, stability), see the dedicated page:  Lifespan & controlled flow rate . 
 
 Short answer 
 The  recommended lifespan  of Ultimate Star Filter® gravity filters is  3,000 liters per filter , or  6,000 liters for a pair . This value represents a  precautionary threshold  intended to ensure  stable filtration  and a  usable flow rate  under typical household conditions. 
 FAQ — Understanding lifespan (without oversimplifying) 
 
 
 Q 
 What exactly does “3,000 L per filter” mean? 
 
 It refers to a  recommended lifespan  (a prudent reference point), defined to maintain:  sufficient retention efficiency , a  usable daily flow rate , and  stable performance . 
 In gravity filtration, water passes through the media without mechanical pressure:  contact time  and  actual flow rate  therefore play a direct role in performance and longevity. 
 
 
 
 Q 
 Does a filter become dangerous after the recommended lifespan? 
 
 The recommended lifespan is  not  a sharp cutoff. A gravity filter does not suddenly stop working: it  saturates progressively . Over time, retention capacity may decrease and  flow rate  may decline. 
 The purpose of replacement is to preserve  consistent  and  predictable  filtered water quality over time, rather than waiting for advanced degradation. 
 
 
 
 Q 
 Does cleaning really extend lifespan? 
 
 Cleaning may  improve flow rate  by removing certain external deposits. However, it does not restore the  internal capacity  of the filtration media (active site saturation, internal fouling). 
 In other words: cleaning mainly improves  user comfort , not the media’s “initial capacity.” 
 
 
 
 Q 
 Why do two households experience very different lifespans? 
 
 Because lifespan depends primarily on the  quality of the treated water  and  usage conditions : contaminant load, presence of particles (turbidity, sediments), daily filtered volume, water temperature, intermittent use, overall hygiene, etc. 
 Two identical systems can therefore evolve differently depending on real-world conditions. 
 
 
 
 Q 
 Does a slow flow rate guarantee better filtration? 
 
 Flow rate influences the  contact time  between water and the filtration media — which can affect performance. However, a very low flow rate may also indicate  saturation  or  fouling  of the media. 
 The goal is a  balanced flow rate : slow enough to preserve contact time, stable enough for practical daily use. 
 
 
 
 Q 
 How can you tell if a filter is saturated? 
 
 The most reliable indicators are:  total filtered volume , a  significant drop in flow rate despite maintenance , particularly challenging water conditions (turbidity, sediments), and the  manufacturer’s recommendations . 
 Flow rate is not only a comfort factor — it is often a  useful indicator  of the filter’s condition. 
 
 
 
 Further reading 
 Lifespan & controlled flow rate   Technology & composition of the Ultimate Star Filter®   Laboratory test results   How does a gravity water filter work?   Design & architecture   NSF® Certification   REACH compliance & material safety  
 
 Conclusion 
 The lifespan of an Ultimate Star Filter® gravity filter is expressed as a  recommended lifespan :  3,000 L per filter  (i.e.,  6,000 L  for a pair). Its purpose is to maintain  reliable  and  stable  filtration over time. 
 Rather than relying solely on a “per-liter” figure, the most relevant approach is to consider  performance stability  and the evolution of  flow rate , taking real usage conditions into account.

Question 4

What is the normal flow rate for an Ultimate Star Filter®?

Accepted Answer

The flow rate of an Ultimate Star Filter® gravity filter may be surprising: it is intentionally  fast yet controlled . Contrary to a common belief, a high flow rate does not imply poor filtration. Efficiency primarily depends on the  actual contact time  between the water and the filter media, as well as the  internal design of the filter . 
 
 
 Key points (quick read) 
 
 A fast flow rate does  not  mean less effective filtration. 
 Efficiency depends on  contact time  and media design. 
 Low-temperature technology allows a high flow rate  without sacrificing performance . 
 Performance is  validated by independent laboratory tests . 
 The gradual decrease in flow over time is normal. 
 
 To understand the role of flow rate in filter lifespan, see:   Lifespan & controlled flow rate  . 
 
 Short answer 
 A new Ultimate Star Filter® typically delivers between  12 and 16 liters per hour  per pair of filters, then the flow rate gradually decreases with use. This flow is intentionally designed to provide an optimal balance between  filtration efficiency  and  practical usability . 
 Why a fast flow can still be highly effective 
 In gravity filtration, water passes through the media without mechanical pressure. What truly determines efficiency is not apparent speed, but the  time during which water interacts with the active materials . 
 The Ultimate Star Filter® multi-layer design — high-quality activated carbons, specific materials, and membrane — provides this necessary contact time while maintaining a practical daily flow rate. 
 Performance therefore relies not on slowness, but on the  quality of materials and internal architecture . 
 Typical observed flow rates 
 
 
 
 Filter condition 
 Approximate flow rate 
 
 
 
 
  New filter  
 12–16 liters / hour 
 
 
 After 750 liters 
 10–12 liters / hour 
 
 
 After 1500 liters 
 ≈ 8 liters / hour 
 
 
 After 2500 liters 
 5–6 liters / hour 
 
 
  Around 3000 liters  
 ≈ 4 liters / hour 
 
 
 
 These values are indicative and may vary depending on water quality, temperature, maintenance, and usage conditions. 
 Why flow decreases over time 
 The gradual decrease in flow is normal: it reflects pore fouling and progressive saturation of active sites in the filter media. This phenomenon is a useful indicator of filter condition, not a failure. 
 The most reliable proof: independent testing 
 Filter performance should not be judged by apparent speed, but by its ability to retain contaminants over time. Ultimate Star Filter® cartridges have been tested by independent laboratories throughout their recommended lifespan. 
 These analyses provide the only objective reference for evaluating real filtration performance. 
 Further reading 
  Flow rate of a gravity-fed water filter    Laboratory test results   Technology & composition     How a gravity filter works  
 
 Conclusion 
 A fast flow rate is not a flaw when the filter design ensures sufficient contact time and stable performance. Real efficiency is measured by objective data, not by an impression of slowness.

Question 5

Do Ultimate Star Filter® filters remove minerals?

Accepted Answer

The minerals in the water are in ionic form. As with most activated carbon filters, minerals in this form are not retained and therefore pass through. 
 The  Ultimate Star Filter®  is designed to  remove pollutants from water  that are harmful to health, but their design allows the minerals to remain in the filtered water. 
 When you drink water filtered by our systems, you are choosing water that is purified, healthy and pure, while retaining the minerals originally present in the water. 
 The Ultimate Star Filter® does not filter limescale either. Read our explanation of  limescale filtration  for more information.

Question 6

Do Ultimate Star Filter® filters remove limescale?

Accepted Answer

Limestone is naturally present in most water sources. This water, which you get from your tap, comes mainly from groundwater, which is a reserve of rainwater that has infiltrated and become loaded with various minerals as it passes through the rocks in the ground. 
 The limestone in water is in ionic form and consists mainly of calcium and magnesium carbonate, minerals that our bodies need to stay healthy. 
  Ultimate Star Filter®  filters do not remove limescale, just like the minerals dissolved in water, and that's a good thing for our health. 
 The limescale in water is therefore an important source of minerals for our bodies and does not need to be removed, unlike by washing machines, dishwashers or coffee makers. 
 If you have very hard water and your installation includes a water softener,  read this topic .

Question 7

Can Ultimate Star Filter® be used with a softener?

Accepted Answer

Some water softeners, installed in the home's water network, use salts to act on limescale, which is harmful to our plumbing systems but useful for our health. 
 If these salts pass into the water after softener treatment, they are incompatible with gravity filters. Their concentration will have a clogging effect on the micro-channels contained in the filters, and what's more, these salts are not intended to be ingested. 
 To find out whether or not your softener is compatible with our filters, simply check that the water leaving the softener is drinkable (see the manufacturer's information on this subject). This information should be included in the documentation for your appliance. If the water leaving the softener is drinkable, it is either because the softener does not use salts (other techniques exist) or because the salts are treated before the water passes through the network.  In this case, and only in this case , you can use the water from your softener with  Ultimate Star Filter®  water filters. 
  Note : some softeners are equipped with a by-pass that allows water to be collected before treatment by the softener. In this case, you should use this water to refill your Star Water Filter® system. 
 If you are in any doubt, please do not hesitate to contact our sales department, by telephone or by using our  contact form .

Question 8

Do Ultimate Star Filter® filters contain silver?

Accepted Answer

Ultimate Star Filter®  filters contain silver in the form of silver ions. These silver ions are integrated into the activated carbon itself, as well as into the filter membrane, in the form of a nanometric support. 
 Depending on the concentration used, silver can be bactericidal (it kills living organisms) or bacteriostatic (prevents any living organisms - bacteria, viruses - from developing on the filter). 
 The concentration of silver ions used in our filters is very low and allows a bacteriostatic action, which guarantees that even if your filtered water contains pathogenic living organisms, these will have no way of developing on the filter and thus risk polluting your filtered water.

Question 9

Compatibility of the Ultimate Star Filter® water filter with other systems

Accepted Answer

Ultimate Star Filter®  filters are perfectly compatible with most other gravity-fed water filtration systems on the market. 
 Their size and the diameter of the threaded rod mean they can be installed on a wide range of systems. They are compatible with Berkey, British Berkefeld, Phoenix, PureWell, Weeplow and other systems. 
 Their  filtration performance , well above that of most filters on the market, and compliance with  European REACH safety regulations , make them an excellent choice. They're a great way to replace your old filters. 
 If you have any doubts, don't hesitate to contact us by telephone or via our  contact form .

Question 10

Are Ultimate Star Filter® filters NSF® certified?

Accepted Answer

All components involved in filtration are NSF® certified. Our  Ultimate Star Filter®  is itself  NSF® certified .  And we are one of the only manufacturers of activated carbon-based gravity water filters to obtain this certification.  
 The main reason for this rarity is that NSF® certification requires not only a study of all the filter components, but also laboratory analyses following a very specific protocol, and last but not least, certification of the production site. These operations take a very long time, require a great deal of preliminary work and are very costly. In addition to the fact that most filters simply couldn't pass NSF® certification due to lack of efficiency, the time and money involved in obtaining this certification puts many brands off. That's why we're all the more proud to have obtained this certification! 
 Beware of the many brands that display an NSF® logo, even though this often relates to only one component of the filter, or sometimes refers to a product that has nothing to do with it... 
 In this case, NSF® certification alone is not a guarantee of quality. It only provides certain guarantees about the protocol used for the analyses. 
 It is also important to look carefully at the results of the analyses provided and the way in which they were carried out (standards used, pollutant concentrations, etc.). 
  Our analyses , on the other hand, were carried out according to the rules, in compliance with the standards and concentrations. 
 As a further guarantee of safety, our filter  complies with European REACH regulations , proving that no hazardous materials are used in our filter.

Question 11

Do Ultimate Star Filter® filters comply with REACH regulations?

Accepted Answer

The main aim of the European REACH (Registration Evaluation and Authorisation of Chemicals) regulation is to improve knowledge of the many chemical substances in circulation. Manufacturers, users and importers of these substances located in the EU must undergo REACH testing. 
 At Star Water Filter®, we take safety and environmental issues very seriously. 
 That's why  all our relevant components have passed the REACH tests , and the filter itself has been tested and accredited. 
 In addition, we have also subjected these same components to RoHS testing to ensure that they do not contain any hazardous substances. The European RoHS directive (Restriction of Hazardous Substances) verifies, among other things, that a component contains no lead, mercury, cadmium, bisphenol B or phthalates. 
 Our components have passed these RoHS tests.

Question 12

What is the useful volume of each model?

Accepted Answer

In all models, the upper tank is slightly smaller than the lower tank, for safety reasons, in order to prevent overflow if the lower tank is not completely empty. 
  As a reminder, here are the commercial names of our models : 
 
  Mini Star Model 5.6 liters  
  Big Star Model 8.5 liters  
  Super Star Model 12.3 liters  
 
  
 The position of the tap on the lower tank, which results in a certain volume of water remaining below it, is completely normal. In addition, the fitting of the upper tank into the lower tank creates a 2 cm overlap, which cannot be filled with water. 
 This results in a calculation of the usable capacity for each model. 
  Usable capacity  (filtered water in the lower tank): 
 
 Mini Star Model: 5 liters 
 Big Star Model: 8 liters 
 Super Star Model: 12 liters 
 
  
 For your information, here are the volumes of residual water in the lower tank below the tap level, for each model. 
 
 Mini Star Model: 1 liter 
 Big Star Model: 1.2 liters 
 Super Star Model: 1.5 liters 
 
  
 For more detailed information, read  our advice on use .

Question 13

What type of water can I filter with my Star Water Filter® gravity water filtration system?

Accepted Answer

What type of water can I filter with my Star Water Filter® gravity water filtration system? 
 Star Water Filter® filtration systems are designed for standalone domestic use, without connection to the water network, in order to filter water intended for consumption. 
 They can be used with tap water, but also with water whose origin and quality are known, provided that appropriate precautions for use are followed. 
 Our filter cartridges have been tested by an independent laboratory on numerous contaminants that may be present in water: heavy metals, PFAS, pesticides, pharmaceutical residues, microorganisms tested according to the available protocols, and more. 
 These results make it possible to assess the filter’s performance under the specific test conditions carried out. As with any domestic filtration system, however, they do not constitute a universal guarantee of treatment for all possible pollutants, in all concentrations and in all situations. 
 Can I use my filter in the event of an incident, a water outage, or with water that does not come directly from the public water supply? 
 A gravity filtration system can be a useful solution to improve the quality of water available at home, especially when you want an additional filtration barrier, without electricity or pressure. 
 When the water does not come from the public water supply, or when an incident affects the usual quality of the water, it is important to proceed with caution. The nature of the water, its origin, how it has been stored and any potential risks must be taken into account before use. 
 If there is any doubt about microbiological, chemical or accidental contamination, the Star Water Filter® system should not be considered a sole and automatic treatment solution. The recommendations of the competent health authorities should be followed and, if necessary, an appropriate analysis should be carried out by a qualified laboratory. 
 Priming, cleaning and maintenance of the system must always be carried out with clean water, in order to avoid contamination of the system or the filter cartridges. 
 If in doubt, please contact us by phone or via our  contact form . 
 Premium Water Distribution SAS declines all liability in the event of use of the system under conditions contrary to the precautions indicated above and to the user instructions.

Question 14

Are Ultimate Star Filter® filters effective against fluorides?

Accepted Answer

What is fluoride? 
 Fluoride (or fluoride ion) is the ionic form of fluorine, which can be found in water in the form of salts. 
 Where does fluoride come from? 
 Fluoride occurs naturally in certain rocks. Its most abundant form is fluorite. The fluoride salts found in water come from the dissolution of fluorite from granite or sedimentary rocks. 
 What is its effect on health? 
 Fluoride is not particularly useful for human growth or development. However, it can help prevent tooth decay. This is why some manufacturers have added fluoride to toothpastes, and why some countries have resorted to water fluoridation. 
 On the other hand, excessive fluoride intake can cause a condition known as bone fluorosis. Fluoride weakens bone structure and can cause certain bones in the body to become brittle. 
 Fluoride in water around the world 
 Fluoride levels in drinking water can sometimes exceed recommended thresholds. This is particularly the case when groundwater comes from volcanic or mountainous areas. 
 At the beginning of the 21st century, around 378 million people worldwide were receiving artificially fluoridated water, the vast majority of them in the United States. Of these, almost 14 million people in Western Europe had access to artificially fluoridated water. 
 The effectiveness of activated carbon filters on fluoride 
 Activated carbon-based filters, even when supplemented by other filter media, are not very effective on fluoride. Only osmosis filters are able to retain it effectively. 
 Our Ultimate Star Filter® is no exception to the rule, and our tests have shown an efficiency of around 45%. 
 As a result, we are studying the design of a complementary filter, which will be effective on fluorides and other pollutants, to complement the main filter for use when the water to be filtered is particularly loaded with these components. 
 While we await the launch of these new filters, our Ultimate Star Filter® is compatible with Berkey® PF-2.

Question 15

Are Ultimate Star Filter® filters effective against nitrites and nitrates?

Accepted Answer

Nitrites and nitrates in water 
 Nitrites and nitrates in water are classified as nitrogen pollutants. Although they occur naturally in the environment, they are mainly introduced in significant quantities by human activity through agriculture, wastewater treatment, and industrial activities. 
 In addition, nitrites are used by the food industry as a preservative in processed meats. However, they also enter ecosystems through the natural process of organic matter degradation, such as plants or leaves. The presence of nitrites in water often indicates organic pollution, which may be due to the presence of urine or feces. 
 Nitrates are an essential nutrient for plant growth. Their excessive presence in water comes from livestock farming and intensive agriculture. Nitrogen fertilizers are broken down into nitrates by bacteria in the soil. 
 Risks associated with the presence of nitrites and nitrates in water 
 Nitrites are classified as probable carcinogens. They are found in high concentrations in processed meats and, in an acidic environment (such as the stomach), they form proven carcinogenic by-products. A study of more than 100,000 people found an increased risk of type 2 diabetes in people who consumed nitrites, including those found in processed meats. 
 This is why their content in drinking water is regulated. The same applies to nitrates, as they can be converted into nitrites. 
 Excessive concentrations of nitrates in water are also a proven source of pollution. They have a harmful effect on aquatic life, promoting the proliferation of harmful algae that reduce oxygen levels, but also on human health. They are responsible for various diseases, including certain forms of cancer. 
 The action of activated carbon filters on nitrites/nitrates 
 Activated carbon reduces nitrite and nitrate levels in water. However, it cannot reduce them completely on its own. Our Ultimate Star Filter® has been tested with an efficiency of around 40%. Analyses carried out on certain activated carbon filters that claim to reduce nitrates by more than 90% should be treated with caution. As things stand, this is simply impossible... 
 We provide real figures, but we are also working on the design of a complementary filter that will be effective against nitrites and nitrates, to be used in addition to our main filter.

Question 16

Is there any silver in Ultimate Star Filter® water filters?

Accepted Answer

Why incorporate silver into water filters? 
 Most water filters contain colloidal silver. It is a natural biocide which, depending on its concentration, either destroys bacteria and pathogens or acts as a bacteriostatic agent by stopping the proliferation of bacteria. These properties have been known since ancient times. There are records of silver being used in Mesopotamia, Persia, Greece and Ancient Rome. The Romans, for example, kept their water in silver jars for this reason. In the Middle Ages, a silver cup was given to newborns to strengthen their immunity. The expression ‘born with a silver spoon in your mouth’ refers to the knowledge that people had at the time about these properties. 
 Colloidal silver works by releasing silver ions into the water, which penetrate and destroy bacterial cells. 
 Use in medicine 
 Colloidal silver was widely used in medicine from the late 19th century until the 1940s, when antibiotics came along. Today, some silver-based creams are still used for their effectiveness on certain skin conditions like psoriasis and warts. 
 Shunned in Europe because the food safety authority refused to comment due to insufficient data on its usefulness, colloidal silver is popular in Anglo-Saxon countries. 
 What do health organisations and the scientific community say? 
 The WHO recommends a maximum concentration of silver ions in water of 0.1 mg/L. Europe, which is more cautious, has set a maximum concentration of 0.08 mg/L. 
 To date, no scientific studies have demonstrated any harmful effects on human health at these concentrations. 
 Silver and human health 
 Silver, like all heavy metals, is dangerous to health in high doses. This is also the case for tobacco, alcohol, fat, sugar, etc. However, at the recommended doses, there is no danger to human health. For reasons that are still poorly understood, humans can tolerate fairly high doses of silver, whose absorption into the bloodstream does not appear to have any direct effect below a certain threshold. 
 The German Federal Institute for Risk Assessment (BfR) wrote in 2009: ‘... a consumer who drinks 2 litres of water treated with a maximum silver concentration of 0.08 mg/l every day for 70 years will have no health concerns.’ 
 The cities of Atlanta, Denver and New York in the United States have a natural silver content of 200 to 300 µg/l (0.2 to 0.3 mg/L), which is two to three times higher than the recommended concentrations, without any negative effects on the health of the population having been recorded. 
 What about our Ultimate Star Filter® filters? 
 Our filters are composed of a mixture of two activated carbons, a compound that improves the treatment of heavy metals and a nanofiltration membrane. All three compounds are NSF® certified. 
 Both the activated carbon and the membrane are loaded with colloidal silver for bacteriostatic purposes, to prevent the development of pathogens and to guarantee safe use for 3,000 litres per filter. 
 Because we are completely transparent in everything we do and say, we have carried out analyses to verify that there is no health risk due to the presence of silver. This is of course the case. 
 At 30 litres, i.e. approximately after the first three filtrations have been discarded, as recommended in our operating instructions, the silver content in the water is already well below the WHO recommendations, at 0.00922 mg/L, and decreases significantly as the filter is used. 
 
 After 100 litres, the concentration is 0.00711 mg/L 
 After 200 litres, the concentration is 0.01014 mg/L 
 After 300 litres, the concentration is 0.00588 mg/L 
 
  
 You can find  the analyses carried out by the SGS laboratory  at this link. 
 At no time does the silver ion concentration approach or exceed regulatory limits. There is therefore no danger in using our Ultimate Star Filter® filters. In addition, our filter has successfully passed  REACH analyses , meaning it complies with European regulations and does not contain any hazardous substances.

Question 17

Is there activated alumina in Ultimate Star Filter® water filters?

Accepted Answer

What is activated alumina? 
 Activated alumina is used in most effective water filtration systems. Activated alumina is made from alumina, or aluminium oxide, which is abundant in the natural environment in the form of minerals. It combines with other substances without changing its chemistry or form. It is therefore a stable, non-toxic compound that does not produce any harmful by-products or waste. 
 Why is it used? 
 Activated alumina is used for water purification in industrial applications, municipal facilities and domestic water filtration systems. It is a highly effective process for removing fluoride, lead, arsenic and other contaminants. 
 How does it work? 
 Activated alumina is highly adsorbent. Because it is porous, its surface area is much larger than its weight, ensuring that large quantities of substances are trapped. Water passes through the filter and contaminants ‘stick’ to the surface of the activated alumina particles, binding to the solid material and becoming permanently trapped. Adsorption is both electrostatic and physical. In the first case, as alumina is positively charged, it will adsorb negatively charged ions. In the second case, the molecules are adsorbed by  van der Waals forces . 
 Aluminium and health risks 
 Aluminium, like all heavy metals, is toxic if absorbed in large quantities. 
 Studies have been conducted and links have been found between aluminium absorption and various diseases, although some of these links have not been formally proven. This is the case, for example, with Alzheimer's disease, for which there is currently no proven cause-and-effect relationship. 
 The French Regional Health Agency writes: ‘Based on current knowledge, no causal link between exposure to aluminium via tap water and Alzheimer's disease can be considered.’ 
 France Alzheimer also writes: "Furthermore, researchers have not identified any convincing biological hypothesis linking aluminium and the development of Alzheimer's disease. Thus, the HCSP report concludes that “to date, it is still not reasonable to consider that aluminium plays a causal role in Alzheimer's disease.” ( https://www.francealzheimer.org/) 
 Standards 
 The WHO has set a threshold of 200 µg/L. This limit is not based on health criteria, but rather on the appearance and turbidity of the water. 
 What about our Ultimate Star Filter® filters? 
 The nanofiltration membrane integrated into our filters is treated with activated alumina, like many filters from leading brands. This membrane is also used worldwide by many customers and in many water filtration models. In addition, it is NSF® certified and has passed REACH and RoHS tests. Nevertheless, in the interests of transparency and because we want to be sure of everything we do at Star Water Filter®, we have carried out aluminium analyses. 
 At 30 litres, i.e. approximately after the first 3 filtrations have been discarded, as recommended in our user guide, the aluminium level in the water is already well below the WHO recommendations, at 0.0476 mg/L, and decreases significantly with continued use of the filter. 
 
 After 100 litres, the concentration is 0.0186 mg/L 
 After 200 litres, the concentration is 0.0106 mg/L 
 After 300 litres, the concentration is 0.0042 mg/L 
 
  
 You can find  the analyses carried out by the SGS laboratory  at this link. 
 At no time does the aluminium ion concentration approach or exceed regulatory limits. There is therefore no danger in using our Ultimate Star Filter® filters. In addition, our filter has successfully passed  the REACH analyses , so it complies with European regulations and does not contain any hazardous substances.

Question 18

Why do black particles sometimes appear in my upper tank?

Accepted Answer

When you  start using  your gravity water filtration system or when you  maintain your filters  after cleaning, black particles may appear in your upper tank. These are grains of activated carbon that have come loose from the outer edge of your filter. This is  normal and has no impact  on filtration quality or health. 
 Our  Ultimate Star Filter®  is a composite filter  consisting of several filter elements , and the outer layer is an assembly of low-pressure moulded activated carbon (patented process) to maintain a fast filtration rate. The outer density is therefore deliberately lower than on a conventional activated carbon filter, which means that a tiny amount may come loose and cause this phenomenon. However, there is no need to worry about this deposit, as our filter is made exclusively from completely harmless components (see  our REACH analysis ). Furthermore, as these residues are contained in the upper tank, they will not pass into the lower tank containing the filtered water. 
 Simply remove them during your next tank maintenance and cleaning. 
 Please do not hesitate to contact  our customer service  if you have any questions.

Question 19

Why are Star Water Filter® gravity water filters among the best water filters on the market?

Accepted Answer

This article explains why Star Water Filter® gravity water filters are among the best on the market, comparing filtration systems and drawing on technical and scientific evidence.  
 
  Topics covered:  
 
 Why filter your water 
 Comparison of jugs, osmosis and gravity filters 
 Designed in France and patent pending 
 Activated carbon, nanofiltration, colloidal silver 
 Independent analyses (PFAS, metals, bacteria, etc.) 
 NSF® certification, service life, flow rate and optimised cost per litre 
 
 
 Choosing a water filtration system is an important decision: we consume this water every day, throughout our lives. It is therefore legitimate to want  concrete evidence , beyond marketing claims. 
 
 Why filtering your water has become essential 
 Even when water is drinkable, it may contain: 
 
 chlorine and disinfection by-products, 
 heavy metals, 
 pesticides, hormones and drug residues, 
 PFAS, VOCs, microplastics. 
 
  
 These pollutants are increasingly present due to human and industrial activity.  Filtering your water  reduces your daily exposure to these substances and protects your long-term health. 
 You can  read more about this topic  for further information on the need to filter your water. 
 
 Comparison of the main filtration systems 
  
 ☑️​ Filter jugs 
 Advantages 
 
 Easy to use 
 Attractive purchase price 
 
  
 Disadvantages 
 
 Limited effectiveness (little or no effect on PFAS, pesticides, hormones, VOCs) 
 High actual cost (cartridges need to be changed frequently) 
 High price per litre filtered for modest performance 
 
 
 ☑️​ Reverse osmosis 
 Advantages 
 
 Highly advanced filtration 
 
  
 Major disadvantages 
 
 Demineralised water (‘dead water’) 
 50 to 80% of the water used is rejected 
 Expensive installation and heavy maintenance 
 Dependence on mains pressure and sometimes electricity 
 Not self-sufficient, not transportable 
 
 
 ✅ Gravity filters (the most balanced solution) 
 Advantages 
 
 Autonomous, no electricity or pressure required 
 Transportable and usable in all circumstances 
 Low maintenance 
 Very low cost per litre filtered 
 Excellent efficiency...  provided the filter is truly effective  
 
  
 ➡️ This is precisely where   Star Water Filter®   makes the difference. 
 
 Why choose Star Water Filter® 
  
 ✔ Recognised expertise 
 The  Star Water Filter®  brand draws on  many years of experience  in gravity filtration in Europe, with tens of thousands of customers. This expertise has enabled us to design a filter based on actual use rather than marketing compromises. 
 
 ✔ French design 
 
 Filters  designed with manufacturers and scientists  
  Patents filed with the INPI  
 The only  French-branded  gravity filters on the market 
 
 
 ✔ Unique, patented composition 
 Unlike conventional filters (moulded carbon or simple ceramic),  Ultimate Star Filter®  filters combine: 
 
 several high-end  NSF®-certified  activated carbons 
 a specific medium for treating  heavy metals  
 a  nanofiltration membrane based on technologies developed by NASA  
 a  patented  low-pressure assembly, guaranteeing high flow rate and consistent performance 
 
  
 ➡️ This architecture is  unique on the market  for gravity filters. 
 
 ✔ Bacteriostatic protection 
 
 Activated carbon and membrane impregnated with  colloidal silver  
 Prevents bacterial growth in the filter 
 Guarantees health safety and  exceptional longevity  
 
 
 ✔ Independent analyses and total transparency 
 Performance is not just claimed but  proven : 
 
 Tests carried out by  SGS  and  Wessling  
 ISO/IEC 17025 certified laboratories ( SGS certificate  and  Wessling ALS certificate ) 
 Analyses on  3,200 litres , beyond the theoretical lifespan 
 
  
 Pollutants tested 
 
 bacteria & viruses 
 heavy metals 
 PFAS 
 pesticides & hormones 
 drug residues 
 VOCs / COHVs 
 microplastics 
 
  
 ➡️ An investment of nearly  €200,000  has been made to guarantee indisputable results. 
 
 ✔ Global NSF® certification 
 
 All components are  NSF® certified  
  NSF® certification for the entire filter  
 
  
 A rare and demanding commitment to gravity filtration. 
 
 ✔ Material safety (REACH) 
 
 Tests carried out by Eurofins 
 Validation of the absence of  247 SVHC substances  (‘List of Substances of Very High Concern’) listed by ECHA (European Chemicals Agency) 
 BPA-free, phthalate-free 
  Total health safety , in addition to filtration performance 
 
 
 ✔ Exceptional lifespan 
 
  ≥ 3,000 litres per filter  
  ≥ 6,000 litres per pair  
  Up to 2 years of use  
 
  
 ➡️ Whereas most filters on the market last 6 months. 
 
 ✔ Fast flow rate 
 
 12 to 16 L/hour per new filter 
 Rare for a gravity filter at this level of performance 
 
 
 ✔ Unbeatable cost per filtered litre 
 
 Approximately £0.02 per litre 
 Much lower than: 
 
 
 filter jugs, 
 reverse osmosis, 
 bottled water (often contaminated with microplastics) 
 
 
 
 
 ✔ Customer service and compatibility 
 
 Experienced customer service, available by telephone and email 
 Compatible with  all gravity filtration systems on the market  
 Screw thread compatible with Berkey® PF2 filters 
 
 
 In summary 
 Star Water Filter® gravity water filters stand out for: 
 
 a  scientifically designed and patented design , 
 independent and public  analyses , 
 superior lifespan and flow rate 
 extremely low cost per litre 
 total health safety 
 
  
 ➡️ These are not marketing promises, but  verified and documented facts , which clearly place   Star Water Filter®  among the best water filters on the market .

Question 20

Can I be self-sufficient in drinking water with Star Water Filter® water filters?

Accepted Answer

This article explains the conditions under which Star Water Filter® gravity water filters can provide self-sufficiency in drinking water, while highlighting the limitations and essential precautions. 
 
  Topics covered:  
 
 Self-sufficiency in drinking water without electricity thanks to gravity filtration 
 Daily use with mains water 
 Off-grid self-sufficiency possible but subject to restrictions 
 Tested pollutants and filter limitations 
 Strict precautions, priming with clean water and health safety 
 
 
 Yes,  Star Water Filter®  gravity water filtration systems have been designed to provide  high autonomy in drinking water , particularly in situations where access to the mains water supply is limited or non-existent (remote homes, travel, van life, off-grid sites, emergency situations, etc.). 
 They operate without electricity, pressure or connection, relying solely on gravity, making them a particularly suitable solution for self-sufficient environments. 
 
 A solution designed for self-sufficiency 
 Star Water Filter® gravity filters allow you to: 
 
  filter tap water  safely on a daily basis; 
 have a  supply of filtered water  directly in the lower tank; 
 operate continuously, without relying on an external power source; 
 meet the needs of a household, a group or nomadic use. 
 
  
 In normal circumstances, with mains water, they are a  reliable and sustainable autonomous solution . 
 
 Off-grid autonomy: possible, but regulated 
 In certain situations (prolonged autonomy, emergencies, travel), it may be possible to use  water that does not come from the drinking water supply . 
 However, this autonomy  does not mean that precautions should not be taken . 
 As specified in this FAQ on  off-grid water filtration , it is essential to remember that: 
 
 our filters have been  tested on a specific list of pollutants ; 
 we  cannot guarantee the filter's effectiveness  on a contaminant that has not been tested; 
 water of unknown origin may pose  serious health risks . 
 
  
 ➡️ Self-sufficiency is therefore  technically possible , but must always be  well thought out and controlled . 
 
 Reminder of essential precautions when operating autonomously 
 If you need to filter water outside the mains supply: 
 
 ✔️ Choose water whose origin you know; 
 ✔️ If possible, carry out  preliminary tests  to identify any pollutants present; 
 ❌ Never use this water for:
 
 priming the filters; 
 cleaning the system. 
 
 
 ✔️ Pour the water directly into the upper tank, without splashing or overflowing. 
 ✔️ Avoid contact with your hands or the internal components of the filter. 
 
    
  Filters must always be primed with clean water , either by soaking or using a tap connected to a drinking water supply 
 
 Self-sufficiency does not mean taking risks 
 Star Water Filter® systems are  powerful tools for self-sufficiency , but they are not a substitute for: 
 
 water analysis in case of doubt, 
 or basic health and safety rules. 
 
  
 Successful self-sufficiency depends on: 
 
 reliable equipment; 
 a good knowledge of your environment; 
 strict compliance with the instructions for use. 
 
  
 
 Need assistance? 
 Every situation of autonomy is different. If in doubt,  contact us : we can help you assess whether your use is compatible with our systems and under what conditions. 
 
 Responsibility 
  Premium Water Distribution SAS  declines all responsibility in the event of failure to comply with the precautions for use and safety mentioned above.

Question 21

How does a gravity water filter work?

Accepted Answer

A gravity filter, as the name suggests, is a filter that uses gravity to ‘push’ the water through the filter media. 
 There are a number of advantages to this filtration principle: apart from its ease of use and maintenance, its main advantage is that the system is completely autonomous. You don't need electricity or water pressure to operate. All you have to do is fill the upper tank, and the water flows through the filter into the lower tank without any external action. This ensures ease of use and maintenance, and complete autonomy, even when you don't have access to a power source or mains water. So it's perfectly usable, even in an emergency. 
 Another advantage is that the low flow rate of this filter means that the water (and its pollutants) are in prolonged contact with the different layers of the filter, resulting in enhanced efficiency. 
 For more information, read our page on  how a gravity-fed water filtration system works in detail .

Question 22

Can I use a TDS reader to check my filtered water?

Accepted Answer

This is a fairly recurrent question, and many people tell us how surprised they are when they read their filtered water readings taken with a TDS (or conductivity) meter. 
  Let's start by being very clear  : a TDS reader cannot be used to check the quality of water, and even less to tell whether or not there are pollutants in the water. That's absolutely not what this device is for. It's like using a screwdriver to drive in a nail or a hammer to fix a screw... 
 What is a TDS reader used for? 
 TDS stands for  T otal  D issolved  S olids and is used to measure solids dissolved in water in ionic form. These can be salts, minerals or metals. This device actually measures the conductivity of the water. The more solids dissolved in water, the more electrically conductive it is. 
 The readers, or TDS meters, therefore indicate a measurement that corresponds to the conductivity of the water, and this measurement is expressed in microsiemens or, more generally, in PPM (Parts Per Million). This unit corresponds to the number of solid particles per million particles of water. In other words, a value of 50 ppm means that in one million particles of water, there are 50 dissolved ions. 
  Can the value measured by a TDS meter indicate water quality?  
 Assuming that water with a value of 0 ppm is pure and free from pollutants is not true. The TDS meter only measures the number of ions dissolved in the water. However, most pollutants, whether pesticides, substances with endocrine effects or drug residues, are generally not ions. What we can say in this case is that the water is free of mineral salts, but it may be highly charged with various pollutants. 
 On the other hand, water with a high value in no way means that it is polluted. It just means that it contains a significant number of mineral salts or metals. 
  The value indicated by a TDS reader is therefore absolutely no indication of whether or not the water is polluted.   Do not use this device for that purpose.   The only way to find out is to have it analysed in a specialised laboratory, where samples are taken very precisely and according to a specific protocol.

Question 23

Why filter tap water?

Accepted Answer

The concept of water potability is based on the absence of substances that are harmful to health. The criteria associated with potability are laid down by health safety agencies and depend on the country concerned. 
 Broadly speaking, they take into account physicochemical, organoleptic and microbiological parameters and the quantity of undesirable substances. 
 The maximum quantities or tolerated thresholds of these undesirable substances are defined according to criteria based on current scientific knowledge. However, these studies are often incomplete or do not take into account new substances discovered at a late stage. Examples include the recent water scandals involving PFAS, TFA and vinyl chloride. 
 New pollutants are discovered regularly, and not only do our drinking water treatment systems become obsolete over time, but they are often ineffective against a growing number of pollutants that concentrate in our groundwater. 
 And even if thresholds are set, below which each pollutant is not supposed to be toxic or dangerous, we know on the one hand that there is a phenomenon of bioaccumulation in the body, and on the other, that the cocktail effects of these substances are poorly known and difficult to identify, although deleterious. 
 As for bottled water, we now know that not only is it polluted, but that its standards are much more relaxed than those for tap water, and that controls are less rigorous. 
 The only way to avoid these risks is to filter and depollute tap water, even if it is still ‘drinkable’ and partly depolluted. Adopt the right approach and opt for  a Star Water Filter® gravity-fed water filtration system . 
 You can find out more on this subject on our ‘ Why filter your drinking water ’ page.

Question 24

How should Ultimate Star Filter® water filters be stored?

Accepted Answer

There are a number of situations in which  Ultimate Star Filter®  filters need to be stored. 
 New filters 
 New filters, unopened and in their original packaging, can be kept indefinitely provided they are stored in a dry, dark and, above all, odour-free place. Activated carbon has the property of absorbing odours and the filter can then concentrate these fragrances and release them when they are put back into service. 
 Filters already in use 
 It all depends on the length of absence. 
 
  For an absence of 3 days or less,  simply leave them in place in the upper tank. 
  For an absence of more than 3 days and less than or equal to 7 days , you should dismantle them and store them in an airtight bag (like a freezer bag) in the fridge, without freezing them. 
  For an absence of more than 7 days , you need to dismantle them, dry them by holding them in a vertical position, with the threaded stem at the bottom, and leave them to dry for at least 2 or 3 days. Once completely dry, you can store them in a cool, dry, odour-free place, ideally in a paper bag. 
 
  
 If you're away for more than 3 days, you'll need to  put the filters back into service . 
 For more information, see our page on how  to use and maintain your Star Water Filter® gravity-feed water filtration system .

Question 25

Maintenance of the Star Water Filter® filtration system

Accepted Answer

Like any appliance designed to receive and store food for human consumption, it needs to be cleaned from time to time. The main maintenance of Star Water Filter® systems consists of regular cleaning of the components that make up the system: tanks, tap, lid and filters. 
 These operations should be carried out every 1 to 3 months, depending on the type of water used and its hardness. 
 For  the tanks and lid , simply use soapy water and/or water containing a little vinegar if there is a tendency for limescale to build up.  Warning : the filters must never be brought into contact with any product whatsoever. 
 For  the tap : apart from regular external cleaning, if the flow rate decreases significantly, we recommend that you dismantle the tap and treat it with household vinegar to remove the limescale. 
 As for  the filters , gently rubbing the outside surface with a sponge under a trickle of water will remove any activated carbon pores that may be blocked by limescale or sediment. This operation should be carried out a few times during the life of the filter if the flow rate decreases significantly. 
 These are the only maintenance operations to be carried out on Star Water Filter® systems. 
 More details on these operations on the  maintenance page for your filtration system .

Question 26

Installation and priming Ultimate Star Filter® filter elements

Accepted Answer

Whether you are installing your system for the first time, replacing your filters, or reassembling your system after storing your filters while you are away, you need to  prime  your filters before installing them in the upper tank. 
 Your filters are made up of several filter media, including activated carbon with tiny pores and micro-channels. These micro-channels are originally filled with air. Because filters work solely by gravity, the pressure allowing water to pass through the filter is very low. If air remains trapped inside the filter, the water will not be able to push it out and will be blocked, resulting in a very slow flow rate, or even none at all. 
  It is therefore necessary to prime the filter before installation.  
 Priming consists of pushing water with a certain pressure inside the filter to expel the air. This is done using a silicone nipple or a silicone priming washer. 
 This operation is described in detail on our  Star Water Filter® system start-up  page.

Question 27

Assembling your Star Water Filter® system

Accepted Answer

Installing your Star Water Filter® gravity filtration system is very simple and intuitive. 
 It consists of fitting the tap to the lower tank, the filters to the upper tank and assembling the two tanks. 
 However, to make assembly as simple and straightforward as possible, and in accordance with the instructions provided, please refer to our page on  assembling your filtration system .

Question 28

How to use your Star Water Filter® filtration system properly?

Accepted Answer

Once your Star Water Filter® system has been installed and the Ultimate Star Filter® filter elements have been properly primed, everyday use is very simple.   
 When filling the system, always take into account the amount of water remaining in the lower chamber to avoid any risk of overflow. The filter elements should remain properly immersed during filtration so that their entire height is used. 
 We also recommend using and renewing the filtered water regularly and following the specific storage instructions when the system is not used for several days. 
 Find all our recommendations on filling, everyday use and storage on our page  How to use your Star Water Filter® water filter properly .

Question 29

Filtration is slow, is this normal?

Accepted Answer

To compare standard flow rates with your own, you can check the  flow rates of Ultimate Star Water® water filters . 
 However, these flow rates are theoretical and depend on several factors: 
 
  Age of your filters : the more a filter is used and the closer it gets to the end of its service life, the more the flow rate will tend to slow down. This is perfectly normal, as the micro-channels in the filter will tend to become blocked over time due to limescale or simply sediment in the water. 
  Water hardness : the harder the water, i.e. the more limescale it contains, the more likely it is that the filter will quickly become clogged due to the obstruction of its outer pores. It will then need to be  cleaned  and  primed . 
  Quality of priming : the way in which filters are primed, whether at start-up, when a new filter is installed, or after long storage, will have a significant influence on filtration speed. The aim of this operation is to expel the air contained in the pores and micro-channels of the filter element so that the water can pass through. In the event of poor priming, a filter may simply not let any water through at all, or at least substantially slow down the flow rate. 
 
  
 In any case, if you notice excessive slowness, clean your filters and then prime them. 
 Another reason for abnormal slowness may be the lack of air passage between the two tanks. For the water to fill the lower tank, the air in it must be able to escape. However, it can happen that the two tanks fit together so well that there is no air passage between them, a phenomenon that can be aggravated if water is present at this point and acts as a watertight seal. If this is the case, the small stainless steel clip supplied should be placed between the two tanks, to create a local gap between the two tanks, allowing air to pass through. 
 If, despite all this advice, you still can't solve your problem, don't hesitate to contact us by phone or via  our contact form .

Question 30

There's still water in my top tank. Is this normal?

Accepted Answer

Yes, that's normal! 
 Your filtration system  works by gravity . In other words, it's the pressure on the filter, linked to the height of the water column in the upper tank, that ‘pushes’ the water through the filter. The lower the water level in the tank, the lower the pressure, and there comes a time when it is no longer sufficient to ‘push’ the water through the filter. 
 What's more, the bottom of the filter is under more pressure than the top, since it is always submerged, and tends to clog up more as a result of limescale or sediment in the water. 
 However, this has no effect on the operation of your filter. This residual water is mixed regularly with the refill water that you bring in regularly ( see this topic on the refill routine ) and is filtered again during the next cycle. 
 As long as the residual water in your top tank does not exceed 5 cm, there's no need to worry. However, if this level tends to increase or  filtration becomes very slow , you will probably need to clean your filter.

Question 31

I have a leak in my Star Water Filter® water filtration system

Accepted Answer

Is your system leaking? Don't panic, we'll help you solve the problem. 
 First of all, you need to identify where the leak is coming from. Water can only flow out of your system through the tap or between the two tanks. 
 Leak at the tap 
 In most cases, the leak is at the level of the washers, because the seal is not properly made. Check that there is a washer on each side of the tank. If a washer is missing or not correctly positioned, this could cause a leak. If the washers are present and correctly positioned, check that the nut holding the two seals and the tap is tight. This should be done by hand, or with an open-ended spanner,  without forcing , so as to ensure a watertight seal, without damaging the seals or the tank itself. 
 More rarely, the leak may come from the tap itself. 
 If you find that drops are dripping from the tap itself, the leak may be due to a deposit of limescale that has built up inside and is preventing the internal seal from sealing properly. In this case, dismantle your tap, open it and fill it with white vinegar, leaving it in a position that allows the vinegar to remain inside. Leave the vinegar to work for a few hours, rinse and refit. 
 Level taps 
 If you have a level tap and the leak is coming from the lower junction between the glass tube and the metal part of the tap, it may be due to a faulty positioning or tightening of the silicone seal between the glass tube and the rest of the tap. 
 In this case, start by trying to tighten the top ring, which will compress the glass tube against the seal. If you can't do this by hand, use pliers and protect the ring with a cloth or sheet of paper to avoid damaging it. If this doesn't solve the problem, the silicone seal at the base of the glass tube may be incorrectly positioned. 
 Unscrew the top ring at the top of the tap that holds the glass tube in place. First by hand, and if you are unable to do so, with pliers, protecting the ring as indicated above. Once you have removed the ring, remove the glass tube. You'll see a silicone seal at the bottom of the top of the tap. Check that it is in the correct position, otherwise replace it correctly. Reposition the glass tube and tighten the ring correctly to compress the glass tube over the seal. 
 If all these solutions do not solve your problem,  contact our customer service  team who will be able to help you. 
 Leak between the two tanks 
 Your Star Water Filter® water filtration system works by gravity. This means that the water passes from the upper tank to the lower tank through the filters by being pushed through by gravity. There is no seal between the two tanks, otherwise the system would not work. This means that if you fill your upper tank when your lower tank is not empty, the water will overflow and pass between the two tanks. You should only fill your upper tank when your lower tank is empty. 
 For more advice on how to use your Star Water Filter® water filtration system, see the  advice for use  page.

Question 32

The tap runs very smoothly even when my tank is full

Accepted Answer

Your lower tank is filled with filtered water, but despite this, the water from your tap flows very slowly. 
 There are two possible reasons for this: 
  Your tap is blocked  
 This can happen if you have very hard water and limescale has gradually built up in the tap pipe. In this case, follow  our maintenance guide , which contains useful information on this subject. 
  Air cannot pass between the two tanks  
 When water flows from the lower tank through the tap, the same volume of air must enter the tank for the flow to occur. In some cases, the two tanks fit together so perfectly that no air enters the lower tank. This can be exacerbated if there is water between the two tanks, acting as a seal. 
 In this case, if you haven't already done so, simply slide the  metal clip  between the two tanks so that a gap is created and air can pass through. 
 If you encounter any difficulties despite these tips, don't hesitate to contact us by telephone or via our  contact form .

Question 33

Filtration stops when there is still water in the upper tank

Accepted Answer

Under normal circumstances, filtration takes place at a constant speed and fairly quickly. 
 You can check the  flow rate of the Ultimate Star Filter®  to see if your filtration time is correct. 
 In some cases, filtration may start, then stop or slow down considerably when there is still a lot of water in the top tank. 
 There are three main reasons for this 
 Lack of maintenance 
 Regular maintenance of your filters is necessary to remove any limescale or sediment deposits that may clog the outer pores of the filter. Read  the maintenance instructions  to find out how to clean your filters. 
 Faulty priming 
 When new filters are installed, or when they are cleaned or put back into service after  a prolonged absence , they must be primed. Without this operation, your filters will not work properly. See our instructions on  priming filters . 
 End of filter life 
 The closer you get to the end of the  filter's life , the more the flow rate will tend to decrease, due to saturation of the filter and its clogging by limescale or natural sediments in the water. 
 The fact that some  residual water remains in the upper tank  after filtration is complete is not the same problem - it's a normal phenomenon.

Question 34

Checking your Star Water Filter® package

Accepted Answer

When you receive your parcel, start by checking that you have all the items corresponding to your order by consulting the delivery note inside the parcel. If you forget or make a mistake, contact us immediately by telephone or via the  contact form  so that we can check and correct the problem as soon as possible. 
 Your parcel always contains a delivery note and an invoice. 
  Assembly ,  start-up ,  maintenance  instructions and  advice on using  your Star Water Filter® water filtration system are available on our website.

Question 35

I have found a damaged product in my parcel

Accepted Answer

When it leaves our warehouse, your parcel has left in perfect condition, but when you open it you notice that one item is damaged. 
 Despite all the care and precautions we take when preparing your parcel, you may find that an item is damaged when you open it. 
 Don't worry, we'll help you resolve the problem. In this case, please contact our customer service department by telephone or via our  contact form , specifying the problem and enclosing a photo. 
 We are here to help you and we will resolve your problem as quickly as possible. 
  Please note : if you notice that the parcel itself is damaged and that the problem therefore stems from transport,   you must make reservations   as indicated in  our delivery conditions . If no reservations are made, we will have no recourse against the carrier and will not be held liable. 
 For further information, please also refer to the section on  damaged packages on receipt .

Question 36

Package damaged on receipt

Accepted Answer

Your parcel has been delivered and you notice that it is damaged. The box is deformed, punctured or seems to have been damaged. 
 In this case, whether the delivery is to a relay point or a home delivery service, you must open the parcel in front of the shopkeeper/delivery person. If you notice the slightest damage,  you must make a note of it on the delivery note  before signing it. Don't hesitate to take photos to keep proof. 
 Then contact our customer service department by telephone using our  contact form , and we will help you to replace the damaged product(s), 
 If the entire contents of your parcel are damaged,  you must refuse the parcel .

Question 37

Why is it important to read the assembly instructions carefully?

Accepted Answer

DO NOT ATTEMPT TO INSTALL YOUR SYSTEM WITHOUT FIRST READING THE FOLLOWING RECOMMENDATIONS.  
  Installation ,  start-up ,  maintenance  and  operating instructions  for your Star Water Filter® water filtration system are available on our website. They are essential for correctly assembling and commissioning your system. They also contain valuable information on the care and maintenance of your water filter. 
 Fitting your system and putting it into service without familiarising yourself with the information contained in these instructions may cause damage that will be detrimental to the smooth operation of your filtration system. 
 If you have any problems understanding or need advice, please do not hesitate to contact us by telephone or via our  contact form . We will be delighted to help you.

Question 38

Star Water Filter® order confirmation

Accepted Answer

When you confirm an order on the Star Water Filter® site by making payment, an order confirmation email is sent to you automatically and immediately. For various reasons, you may not receive this email. 
 Here are a few tips to help you identify the reason: 
 
 Check your spam folder to see if it has been flagged as such by your e-mail provider. If this is the case, retrieve it and take the opportunity to declare our email address for this delivery as acceptable so that this problem cannot occur again. 
 You may have made a typing error when entering your e-mail address in your customer account. If you are still logged in to your account, please check the address you have entered and amend it if necessary. Contact us by telephone or via  our contact form  so that we can send you the e-mail again. 
 If you are unable to connect to your account because you cannot find the e-mail address you entered, contact us by telephone or via  the contact form  so that we can change the e-mail address for you and send you your order confirmation e-mail. 
 
  
 If none of these checks can explain why you have not received your order confirmation e-mail, please contact us by telephone or via  the contact form  and we will get back to you as soon as possible.

Question 39

Online payment problem on the Star Water Filter® site

Accepted Answer

On the Star Water Filter® site, you can pay either by credit card via Crédit Agricole or PayPal, or via your PayPal account, or by cheque (for France) or bank transfer. 
 If you encounter a problem when paying for your order online, here's what you need to do: 
  Payment by cheque or by bank transfer:  
 In this case, you can contact us by telephone or via  the contact form , stating your name and the nature of the problem you are experiencing so that we can solve your problem. 
  PayPal payment : 
 In the case of a PayPal payment, whether by credit card or via your account, you should contact PayPal customer service. We cannot intervene directly in problems related to their payment platform. 
 For any other problem, you can contact us by telephone or via  the contact form .

Question 40

Can I change my order?

Accepted Answer

You've placed an order and would like to change its content or delivery address, for example. 
 Depending on the status of the order, some things can still be changed. However, if your order has already been prepared or handed over to the carrier, we will no longer be able to change anything. 
 Before 1pm, some of these changes are still possible. After this time, it will no longer be possible, as your order will have been prepared or dispatched. 
 In all cases, please contact us as soon as possible by telephone or via  our contact form .

Question 41

I want to cancel my order

Accepted Answer

Orders are validated and prepared every day (except weekends)  and cannot be changed after 1pm . 
 If you place your order in the afternoon, it can be cancelled before dispatch until 1pm the following day. If you place your order in the morning, it must be cancelled before 1pm. 
 If your order has already been dispatched, it can no longer be cancelled and you will have to submit a cancellation request. You will be responsible for the cost of returning the parcel. 
 In all cases, you must contact our customer service department using  our contact form , indicating your order reference. 
 You will receive a reply very quickly, and your refund will be processed within a few days.

Question 42

I want to return my order

Accepted Answer

First of all, you must  contact our customer service department  to inform us of your withdrawal request. 
 We need to validate that your request meets the eligibility requirements for a return. See our  returns policy  for more information. 
 Once these conditions have been validated and our agreement given, you must return your products within 5 days. 
 The return costs are at the customer's expense. The initial shipping costs remain at the customer's expense for all shipments outside the EU.

Question 43

What hygiene precautions should I follow when using my Star Water Filter® system?

Accepted Answer

What hygiene precautions should I follow with my Star Water Filter® system? 
 Star Water Filter® systems are designed for standalone domestic use, without connection to the water network and without integration into a fixed installation. 
 They can be used with tap water, but also with water whose origin and quality are known, intended for consumption, provided that the precautions for use indicated on the product pages and in the user instructions are followed. 
 Storage of filtered water 
 Filtered water is intended to be consumed quickly. It is recommended to consume it within 24 hours after filtration, and within a maximum of 48 hours. 
 Do not leave water standing for several days in the lower chamber. In the event of a prolonged absence, or if filtered water has remained in the system for more than 48 hours, empty the chamber, clean the system, then refill it with suitable water. 
 If filtered water is transferred to another container, use a clean, closed container, kept in the refrigerator and away from direct sunlight. 
 Cleaning and maintenance 
 Cleaning and maintenance of the system must always be carried out with clean, potable water in order to avoid any contamination of the system or the filter cartridges. 
 Regularly clean the chambers, lid, tap and all parts in contact with water, in accordance with the recommendations in the user instructions. Do not use aggressive, abrasive or non-food-safe products. 
 Priming and initial setup 
 Before first use or after any cartridge replacement, priming, rinsing and initial setup must be carried out in accordance with the steps indicated in the user instructions. 
 Priming must always be carried out with clean, potable water. Do not use spring water, well water, rainwater, river water, tank water or water of unknown quality to prime the cartridges. 
 Replacement of cartridges 
 The filter cartridges must be replaced according to the maximum capacity and replacement frequencies recommended by Star Water Filter®. Beyond these recommendations, the stated performance can no longer be guaranteed. 
 Use only official Star Water Filter® filter cartridges that are compatible with your system. The use of non-official, modified, damaged or incompatible cartridges may affect the operation of the system and the quality of the filtered water. 
 Limitations of use 
 The Star Water Filter® system should not be considered a sole and automatic treatment solution in the event of suspected microbiological, chemical or accidental contamination. 
 Do not use with microbiologically unsafe, suspicious or unknown-quality water without appropriate prior treatment and confirmation that it is suitable for consumption. 
 If in doubt about the quality of the water, follow the recommendations of the competent health authorities or have an appropriate analysis carried out by a qualified laboratory.

Frequently asked questions

Faq categories

Faq Sections