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NSF 44

2016 Edition, September 19, 2016

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Residential Cation Exchange Water Softeners

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Product Details:

  • Revision: 2016 Edition, September 19, 2016
  • Published Date: September 19, 2016
  • Status: Active, Most Current
  • Document Language: English
  • Published By: NSF International (NSF)
  • Page Count: 68
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

The manual, autoinitiated, and demand-initiated regeneration residential cation exchange water softeners addressed by this Standard are designed to be used for the removal of hardness and the reduction of specific contaminants from drinking water supplies (public or private) considered to be microbiologically safe and of known quality. Systems with components or functions covered under other NSF or NSF/ANSI Standards or Criteria shall conform to the applicable requirements therein.


The purpose of this Standard is to establish minimum requirements for materials, design and construction, and performance of residential cation exchange water softeners. This Standard also specifies the minimum product literature that manufacturers shall supply to authorized representatives and owners, as well as the minimum service-related obligations that manufacturers shall extend to owners.