Historical
NSF/ANSI 50-2005
[Historical Standard] Circulation system components and related materials for swimming pools, spas/hot tubs
This Standard covers circulation system components, treatment devices, and related materials. The components, treatment devices, and related materials are intended to be used specifically for swimming pool, spa/hot tub water circulation and treatment in public and residential applica¬tions. No attempt has been made to incorporate safety provisions. This Standard is not intended to cover components intended to treat water exceeding a total dissolved solids concentration of 3000 ppm.
NSF International [nsf]
