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.
NSF International [nsf]
This revision harmonized the structural integrity requirements in Table 5 of NSF/ANSI 42, NSF/ANSI 44 and NSF/ANSI 53.