https://fondsites.com/tags/nsf-ansi-58/Recent content in NSF ANSI 58 on FondsitesHugoen-usFri, 29 May 2026 13:43:57 +0300https://fondsites.com/clear-water-lab/guidebooks/filter-certifications/Tue, 19 May 2026 00:00:00 +0000https://fondsites.com/clear-water-lab/guidebooks/filter-certifications/<p>The numbers on water filter standards are not a scoreboard. NSF/ANSI 42, 53, 58, and 401 describe different types of products and claims. The useful question is not which number is highest. It is whether the exact product is certified for the exact contaminant reduction you care about.</p> <div class="info-box info-box--warning" role="note" aria-label="Heads up"> <div class="info-box__icon" aria-hidden="true"><svg viewBox="0 0 24 24" focusable="false"> <path d="M12 4 3 20h18L12 4Z" /> <path d="M12 9v5" /> <path d="M12 17h.01" /> </svg></div> <div class="info-box__body"> <div class="info-box__eyebrow">Heads up</div><div class="info-box__title">Water safety boundary</div> <div class="info-box__content">Clear Water Lab helps with everyday water decisions, reports, testing, certification checks, and maintenance. It is not medical advice, legal advice, or a substitute for local boil-water notices, certified lab results, utility instructions, or health department guidance.</div> </div> </div> <p><img src="https://fondsites.com/clear-water-lab/images/guidebooks/verify-water-filter-claim.avif" alt="A verified water filter claim worksheet with standards, model numbers, cartridges, and a calm countertop setup" loading="lazy" decoding="async"></p>