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NSF 50-2013

Equipment for Swimming Pools, Spas, Hot Tubs and other Recreational Water Facilities
standard by NSF International, 12/03/2013

NSF 358-2-2012

Polypropylene Pipe & fittings for water-based ground-source "geothermal" heat pump systems
standard by NSF International, 12/06/2012

NSF 46-2012

Evaluation of components and devices used in wastewater treatment systems
standard by NSF International, 12/23/2012