Historical
NSF/ANSI 44-2015
Residential cation exchange water softeners
This revision harmonized the structural integrity requirements in Table 5 of NSF/ANSI 42, NSF/ANSI 44 and NSF/ANSI 53.
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NSF International [nsf]
This revision harmonized the structural integrity requirements in Table 5 of NSF/ANSI 42, NSF/ANSI 44 and NSF/ANSI 53.