Laboratory test results for the Ultimate Star Filter® gravity water filter
At Star Water Filter®, we made a simple choice: to precisely document our performance so that it can be independently verified.
The results presented on this page are based exclusively on:
- analyses conducted by accredited independent laboratories
- reproducible testing protocols
- measurements carried out on a total volume of up to 3,200 liters filtered, beyond the recommended service life
The objective is not to provide a single isolated figure, but a realistic assessment of performance over time.
This page presents:
- the test methodology
- the categories of contaminants analyzed
- the summary results by testing stage
- access to the full reports in PDF format
Methodology and analytical framework
Why 3,200 liters?
Tests were conducted up to 3,200 liters filtered to evaluate the filter’s effectiveness over time, including beyond the recommended service life (3,000 L). This approach provides a realistic view of the filter’s behavior during extended use.
Independent laboratories accredited to ISO/IEC 17025
Analyses are performed by independent testing laboratories accredited to ISO/IEC 17025 (Wessling certificate — SGS certificate).
This accreditation guarantees:
- technical competence
- traceability of methods
- reliability of measurements
- reproducibility of results
Measurements at multiple stages
Performance is measured at different filtration volumes.
10 L — 750 L — 1,500 L — 2,250 L — 3,000 L — 3,200 L
This makes it possible to observe:
- initial efficiency
- stability over time
- end-of-life performance changes
Heavy metals and NSF/ANSI 53 standard
For heavy metals, analyses are conducted, where applicable, with reference to the NSF/ANSI 53 standard, at different pH levels (6.5 — 7.5 — 8.5).
Objective: to reproduce realistic water conditions.
Contaminants analyzed
The substances listed below are provided for informational purposes.
The detailed numerical results are presented in the tables and PDF reports.
Heavy metals (NSF/ANSI 53 where applicable)
Aluminum, Antimony, Arsenic, Barium, Beryllium, Bismuth, Cadmium, Chromium, Copper, Iron, Manganese, Mercury, Nickel, Lead, Selenium, Zinc.
PFAS
Trifluoroacetic acid (TFA), Perfluorohexanoic acid (PFHxA), Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonic acid (PFOS).
Plastic derivatives
Bisphenol A, Octylphenol, Nonylphenol.
Chlorine and derivatives
Total chlorine, Free chlorine, Combined chlorine (chloramines).
Pharmaceutical residues
Amoxicillin, Ibuprofen, Erythromycin, Gemfibrozil, Naproxen, Paracetamol, Carbamazepine, Diazepam, Diclofenac, Primidone, Sulfamethoxazole, Trimethoprim.
Hormones
17 beta-Estradiol, Ethinylestradiol.
Pesticides / Herbicides
Glyphosate, AMPA, Glufosinate, Aldrin, Atrazine, cis-Chlordane, trans-Chlordane, Chlordecone, Chlorothalonil, DDD, DDE, DDT, Dieldrin, Endosulfan alpha, Endosulfan beta, Endrin, Heptachlor, Lindane, Methoxychlor, Quintozene, Imidacloprid, Metolachlor.
Solvents
Vinyl chloride, Dichloromethane, cis-1,2-Dichloroethylene, trans-1,2-Dichloroethylene, Trichloromethane, 1,1,1-Trichloroethane, Carbon tetrachloride, Trichloroethylene, Tetrachloroethylene, 1,1-Dichloroethane, 1,1-Dichloroethylene, Benzene, Toluene.
Microplastics
Analyses specifically dedicated to microplastics.
Analysis results
The tables below present, for each contaminant category, the reduction measured at different filtered volumes.
The PDF reports detail:
- initial concentration
- concentration after filtration
- analysis method
- detection limits
- experimental conditions
How to read the tables
- 1 row = 1 contaminant
- 1 column = 1 volume stage
- The final stage is highlighted
- “ND” = Not Detected (below the detection limit)
Final stage:
- 3,000 L for microbiology
- 3,200 L for chemistry
⬇️ Microbiology — Bacteria / Salmonella / Viruses (final stage: 3000 L)
| Contaminant | 10 L | 750 L | 1500 L | 2250 L | 3000 L |
|---|---|---|---|---|---|
| Bacteria | >99.9999% | 99.9999% | 99.9048% | 99.6590% | >99.9999% |
| Salmonella | >99.999% | — | 99.6632% | — | >99.999% |
| Viruses | 99.99% | — | 99.98% | — | 99.99% |
Note: “—” = stage not tested / not applicable in this report.
⬇️ Heavy metals — pH 6.5 (final stage: 3200 L)
| Metal | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Arsenic (As) | 99,4% | >99,6% | >99,5% | >99,5% | >99,5% |
| Barium (Ba) | >99,9% | >99,9% | 99,9% | 99,7% | 99,9% |
| Cadmium (Cd) | >98,4% | >98,4% | >98,4% | >98,3% | >98,4% |
| Chromium (Cr) | >99,7% | >99,7% | >99,6% | >99,7% | >99,6% |
| Copper (Cu) | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Mercury (Hg) | >97,7% | >97,9% | >96,7% | 97,0% | 95,4% |
| Lead (Pb) | 99,3% | >99,5% | >99,5% | >99,5% | >99,5% |
| Selenium (Se) | ND | ND | ND | ND | Not detected |
Note: “ND / Not detected” = below the detection limit according to the report. “>” values indicate a minimum reduction.
⬇️ Heavy metals — pH 7.5 (final stage: 3200 L)
| Metal | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Antimony (Sb) | 99,5% | 99,4% | 99,2% | 99,5% | 99,4% |
| Beryllium (Be) | >99,5% | >99,4% | >99,4% | >99,5% | >99,4% |
| Bismuth (Bi) | 99,5% | >99,4% | >99,4% | >99,5% | 98,5% |
| Iron (Fe) | 98,18% | >99,9% | >99,9% | >99,9% | >99,9% |
| Manganese (Mn) | >99,9% | 99,9% | 99,9% | 99,8% | 99,9% |
| Nickel (Ni) | >99,7% | 99,7% | 99,23% | 98,48% | 99,4% |
| Zinc (Zn) | >99,9% | 99,9% | 99,9% | 96,5% | 97,3% |
⬇️ Heavy metals — pH 8.5 (final stage: 3200 L)
| Metal | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Arsenic (As) | >99,5% | >99,5% | >99,5% | >99,5% | >99,5% |
| Barium (Ba) | 99,9% | 99,9% | 99,9% | 99,9% | 99,9% |
| Cadmium (Cd) | >98,3% | >98,4% | >98,4% | >98,4% | >98,4% |
| Chromium (Cr) | 98,7% | >99,7% | >99,6% | >99,7% | >99,7% |
| Copper (Cu) | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Mercury (Hg) | >96,7% | >96,6% | >97,2% | >98,2% | >96,9% |
| Lead (Pb) | >99,6% | >99,6% | >99,62% | >99,62% | >99,48% |
| Selenium (Se) | ND | ND | ND | ND | Not detected |
⬇️ PFAS — PFOA / PFOS / PFHxA / TFA (final stage: 3200 L)
| PFAS | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| PFOA | >98,3% | >97,9% | >97,6% | >97,8% | >98,4% |
| PFOS | >98,7% | >99% | >98,9% | >99,2% | >99% |
| PFHxA | >99% | >99% | >99% | >99% | >99% |
| TFA | >97% | >96,9% | >97,2% | >97,3% | >97,1% |
⬇️ Plastic derivatives — BPA / Nonylphenol / Octylphenol (final stage: 3200 L)
| Substance | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| BPA | >99,8% | >99,8% | >99,8% | 99,4% | >99,8% |
| Nonylphenol | >99,3% | >99,3% | >99,3% | >99,3% | >99,3% |
| Octylphenol | >99,8% | 99,3% | >99,8% | 98,1% | 99,1% |
⬇️ Chlorine and derivatives — Total chlorine / Free chlorine / Chloramines (final stage: 3200 L)
| Parameter | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Total chlorine | >99,5% | >99,5% | >99,5% | >99,5% | >99,5% |
| Free chlorine | >99,5% | >99,5% | >99,5% | >99,5% | >99,5% |
| Chloramines | >99,5% | >99,5% | >99,5% | >99,5% | >99,5% |
⬇️ Pharmaceutical residues (final stage: 3200 L)
| Molecule | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Amoxicillin | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Erythromycin | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Carbamazepine | 99,2% | 99,2% | 99,2% | 99,2% | 99,2% |
| Primidone | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Diazepam | >98% | >98% | >98% | >98% | >98% |
| Diclofenac | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Ibuprofen | 99,3% | 99,3% | 99,3% | 99,3% | 99,3% |
| Naproxen | >97,9% | >97,9% | >97,9% | >97,9% | >97,9% |
| Gemfibrozil | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Paracetamol | >98% | >98% | >98% | >98% | >98% |
| Sulfamethoxazole | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Trimethoprim | >97,9% | >97,9% | >97,9% | >97,9% | >97,9% |
⬇️ Hormones — Estradiol / Ethinylestradiol (final stage: 3200 L)
| Hormone | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Estradiol | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
| Ethinylestradiol | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
⬇️ Pesticides / Herbicides — 3200 L summary (readable)
Readability choice: this table shows the reduction at the final stage (3200 L). On mobile, a “by-stage” table would be hard to read. If you want, we can add a detailed by-stage sub-table below.
| Substance | Reduction at 3200 L |
|---|---|
| Aldrin | >99,5% |
| Dieldrin | >99% |
| DDD | >99% |
| DDT | >99% |
| DDE | >99% |
| Endosulfan alpha | >96% |
| Endosulfan beta | >96% |
| Endrin | >99,1% |
| Heptachlor | >99,5% |
| Lindane | >99,1% |
| Methoxychlor | >98,5% |
| Quintozene | >99% |
| cis-Chlordane | >99,5% |
| trans-Chlordane | >99,5% |
| Chlorothalonil | >99,4% |
| Atrazine | >99,7% |
| Imidacloprid | >99,9% |
| Metolachlor | >99% |
| Glyphosate | >99,9% |
| AMPA | >99,9% |
| Glufosinate | 97,8% |
| Chlordecone | >99,5% |
⬇️ VOCs — Benzene / Toluene (final stage: 3200 L)
| Substance | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Benzene | >96,7% | >96,7% | >96,7% | >96,7% | >96,7% |
| Toluene | >99,9% | >99,9% | >99,9% | >99,9% | >99,9% |
⬇️ VOChl — chlorinated solvents (3200 L summary)
| Solvent | Reduction at 3200 L |
|---|---|
| Vinyl chloride | >99,5% |
| Dichloromethane | >99,9% |
| cis-1,2-Dichloroethylene | >99,9% |
| trans-1,2-Dichloroethylene | >99,8% |
| Chloroform | >99,6% |
| 1,1,1-Trichloroethane | >99,9% |
| Carbon tetrachloride | >99,7% |
| Trichloroethylene | >99,6% |
| Tetrachloroethylene | >97,1% |
| 1,1-Dichloromethane | >96,8% |
| 1,1-Dichloroethylene | >97,7% |
Note: final-stage summary to ensure comfortable reading on mobile. “>” values indicate a minimum reduction.
⬇️ Microplastics (summary at 3200 L)
| Parameter | 10 L | 750 L | 1500 L | 2250 L | 3200 L |
|---|---|---|---|---|---|
| Particles 5µm–20µm | 99.9% | 99.7% | 99.9% | 99.9% | 99.9% |
Why publish these results?
In a field where comparisons can be imprecise, our approach is to make performance:
measurable — documented — verifiable
Publishing the full protocols and results makes it possible to:
- avoid unsupported claims
- enable comparison on objective grounds
- provide verifiable transparency
Conclusion
The analyses of the Ultimate Star Filter® were designed to provide information that is:
clear — verifiable — reproducible
They are based on:
- a rigorous protocol
- accredited independent laboratories
- performance monitoring over time
- results published up to 3,200 liters filtered