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 the NSF/ANSI 42 and NSF/ANSI 53 protocols, with more than 200 elements analyzed.
We are ceasing the marketing of Coldstream FTO+filters. This development marks the arrival of our new range Imperial AMB and Imperial GF, available at the end of September, manufactured in the United States. Their compatibility with major gravity fountains ensures a simple transition for our customers.
| Filter / Brand | NSF certified | Tested according to NSF/ANSI 42 | Tested according to NSF/ANSI 53 | Laboratory | Analyzed elements |
|---|---|---|---|---|---|
| 🥇 Monderma Impérial AMB USA | ✓ | ✓ | ✓ | Envirotek Inc. (USA) | 200+ items analyzed |
| 🥇 Monderma Impérial GF USA | ✗ | ✓ | ✓ | 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+ elements analyzed |
| Monderma Black Filters | ✓ | ✓ | — | Independent laboratory | Data on request |
| EVA fountain | ✗ | — | — | 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 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. Data must be verified with updated test certificates and reports before final publication. Last updated: June 2026. The brands mentioned remain the property of their respective owners.