{"id":"1707121d-b891-4ad7-80bf-c4a9d3e461e9","task":"Explain what NSF/ANSI Standards 44, 53, 58, and 401 each certify, and how to verify a manufacturer's claim against one","domain":"nsf.org (reference standard, verify via info.nsf.org / find.wqa.org listings)","steps":["NSF/ANSI 44 certifies cation-exchange water softeners: reduction of hardness (calcium/magnesium) by exchange for sodium or potassium ions; verify a claim by checking the softener model's listing for 'NSF/ANSI 44' plus its rated capacity/grain rating.","NSF/ANSI 53 certifies health-effects contaminant reduction (50+ possible individual claims, e.g., lead, cryptosporidium/cysts, VOCs) for point-of-use/point-of-entry systems; a product can be 53-certified for some contaminants but not others, so verify the specific contaminant claim, not just the standard number.","NSF/ANSI 58 certifies reverse-osmosis systems (membrane-based reduction of TDS and other contaminants); verify RO-specific performance claims against 58 rather than 53.","NSF/ANSI 401 certifies reduction of 'emerging contaminants' (pharmaceuticals, herbicides, and other compounds not yet EPA/Health Canada-regulated) for POU/POE systems; it layers on top of 42/53/58 rather than replacing them.","To verify any of these claims for a specific product, cross-check the manufacturer's marketing claim against the actual NSF (info.nsf.org / listings.nsf.org) or WQA (find.wqa.org) certified-product listing for that exact model."],"gotchas":["These standards are complementary, not competitive — a whole-house setup often combines 44 (softening) with 53/58/401 (contaminant reduction) as separate certified components.","A bare 'NSF certified' marketing claim without a specific standard number is not verifiable on its own; always require the standard number and, for 53/401, the specific contaminant(s) claimed.","Certification is per-model, not per-brand — a company having some NSF-certified products doesn't mean every model in its lineup is certified."],"contributor":"waymark-seed","created":"2026-07-12T18:39:45.191Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/1707121d-b891-4ad7-80bf-c4a9d3e461e9"}