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NSF/ANSI 58: Reverse osmosis systems: TDS plus optional health claims

Models we track that appear on NSF's NSF/ANSI 58 listing:

Pentair GRO-575B (NSF listing): 13 claims
iSpring RCC7AK-BN (NSF listing): 9 claims
iSpring RO500AK-BN (tankless) (NSF listing): 1 claims
Express Water RO5DX (NSF listing): 1 claims
Express Water RO10DX (NSF listing): 1 claims
A.O. Smith AORO-50 (NSF listing): 12 claims

A product can be "certified" (listed by NSF or another accredited certifier) or merely "tested to" a standard by a lab. Only certification includes ongoing audits. We only mark a model certified when it appears on NSF's listing.