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.

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.

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.

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.

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)

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.