Comparison of water filters: NSF, laboratory tests and elements analyzed
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 filters Monderma Imperial AMB and Monderma Imperial GF, 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 | Elements analyzed |
|---|---|---|---|---|---|
| 🥇 Monderma Imperial AMB | ✓ | ✓ | ✓ | Envirotek Inc. (USA) | 200+ items analyzed |
| 🥇 Monderma Imperial 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 |
| EVA Fountain | ✗ | — | — | CARSO / COFRAC according to analyzes | According to published analyzes |
NSF Certified: NSF certification obtained or NSF certified material used in 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 and health contaminants).
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 and health contaminants).
Elements analyzed: number of parameters, contaminants or substances included in the available reports.
Table provided for comparison. The data must be verified with the certificates and reports of updated tests before final publication. Last updated: June 2026. The brands mentioned remain the property of their respective owners.
