Comparison of water filters: NSF, laboratory tests and analyzed elements
An NSF certification is not always enough to judge the real effectiveness of a filter. The most important thing is to check the contaminants actually analyzed, the protocols used and the laboratory that carried out the tests.
Our premium selection: the Mondema Impérial AMB and Mondema Impérial GFfilters, tested by Envirotek Inc. (USA) according to NSF/ANSI 42 and NSF/ANSI 53 protocols, with more than 200 elements analyzed.
| Filter / Brand | NSF certified | Tested according to NSF/ANSI 42 | Tested according to NSF/ANSI 53 | Laboratory | Analyzed items |
|---|---|---|---|---|---|
| 🥇 Monderma Impérial AMB | ✓ | ✓ | ✓ | Envirotek Inc. (USA) | 200+ items analyzed |
| 🥇 Monderma Impérial GF | ✓ | ✓ | ✓ | Envirotek Inc. (USA) | 200+ items analyzed |
| Coldstream FTO+ | ✗ | ✓ | ✓ | IAPMO R&T (USA) | 200+ items analyzed |
| Coldstream CTO+ | ✗ | ✓ | ✓ | Envirotek Inc. (USA) | 100+ items analyzed |
| Black Berkey | ✗ | ✓ | ✓ | Envirotek Inc. (USA) | 200+ contaminants analyzed |
| Phoenix Gravity | ✓ | ✓ | ✗ | NSF / independent laboratories | 150+ items analyzed |
| Monderma Black Filters | ✓ | ✓ | — | Independent laboratory | Data on request |
| Doulton / British Berkefeld | ✓ | ✓ | ✓ | UK organizations / laboratories | According to certificates |
| Brita | ✓ | ✓ | According to models | According to models | According to models |
| Fontaine EVA | ✗ | — | — | CARSO / COFRAC according to analyses | According to published analyses |
NSF certified: NSF certification obtained or NSF certified material used in the filter.
Tested according to NSF/ANSI 42 and 53: tests carried out according to the performance protocols of the corresponding NSF/ANSI standards (reduction of aesthetic contaminants and
Elements analyzed: number of parameters, contaminants or substances included in the available reports.
Tested according to NSF/ANSI 42 and 53: tests carried out according to the performance protocols of the corresponding NSF/ANSI standards (reduction of aesthetic contaminants and
Elements analyzed: number of parameters, contaminants or substances included in the available reports.
Table provided for comparison. Data must be verified with updated certificates and test reports before final publication. Last update: June 2026. The brands mentioned remain the property of their respective owners.