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NSF 50-2008

Equipment for Swimming Pools, Spas, Hot Tubs and other Recreational Water Facilities – Evaluation criteria for materials, components, products, equipment and systems for use at recreational water facilities
standard by NSF International, 02/15/2008

NSF 401-2017a

Drinking Water Treatment Units – Emerging Compounds/Incidental Contaminants
standard by NSF International, 10/27/2017