Filtration: The best comparison of NSF certifications by brand
Comparison of NSF certifications by brand
✓ Compliant (certified / tested according to standard)
✗ Non-compliant/unclaimed
— Not communicated
| Brand | NSF 42 | NSF 53 | NSF 372 | NSF P231 | Independent laboratory analyzes |
|---|---|---|---|---|---|
| Monderma FTO+ | ✓ | ✓ | ✓ | ✓ | ✓ (Coldstream – UK) |
| Monderma CTO+ MAX (countertop) | ✓ | ✓ | ✓ | ✓ | ✓ (Coldstream – UK) |
| Berkey | — | — | — | — | 200+ contaminants tested (USA) |
| Doulton | ✓ | ✓ | ✓ | ✗ | ✓ (UK – WRAS) |
| Weeplow | ✓ | ✓ | ✓ | ✗ | — |
| Boroux | ✗ | ✗ | ✓ | ✗ | — |
| Brita | ✓ | ✗ | ✓ | ✗ | ✓ (TÜV – Germany) |
| Monderma Black Filters | ✓ | — | — | — | ✓ (France – COFRAC) |
| Phoenix | ✓ | — | ✓ | — | — |
| Eva Fountain | — | — | — | — | ✓ (CARSO – France, COFRAC approved) |
Note: Berkey is not officially NSF certified but has tested for over 200 contaminants in independent laboratories in the United States, exceeding minimum requirements.
Role and scope of each standard
NSF/ANSI 42 — Taste, odor and appearance
Reduction of free chlorine and improvement of taste, odor and turbidity (sensory comfort).
NSF/ANSI 53 — Contaminants with health impacts
Reduction of more than 50 contaminants chosen by the brand: heavy metals, nitrates/nitrites, pesticides/herbicides, solvents, THM/HAA5, asbestos, cysts, etc.
NSF/ANSI 372 — Lead-Free Compliance
Verifies that materials in contact with water contain ≤ 0.25% lead (material safety, non-filtration performance).
NSF P231 — Microbiological Performance
Reduction of ≥ 99.9999% of bacteria (6 log), ≥ 99.95% of parasites (3 log) and ≥ 99.99% of viruses (4 log), according to EPA protocols.
Brands cited for information purposes. The names and logos remain the property of their owners. Always check official certificates and updated test reports before publication.
