NSF ANSI 44:2018 pdf download.Residential Cation Exchange Water Softeners.
The manual, auto-initiated, and demand-initiated regeneration (DIR) residential cation exchange water softeners addressed by this Standard are designed for the reduction of specific substances that may be present in drinking water (public or private) considered to be microbiologically safe and of known quality. Systems covered under this standard are intended to reduce hardness affecting the aesthetic quality of water. The established health hazards, barium and radium, are optional performance claims addressed by this Standard. Systems with manufacturer claims that include components or functions covered under other NSF or NSF/ANSI Standards or Criteria shall conform to the applicable requirements therein. Systems covered by this Standard are not intended to be used with drinking water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.
NOTE — Systems that are compliant with NSF/ANSI 55 Class A or other standards that cover technologies to treat microbiologically unsafe water (e.g., US EPA Guide Standard and Protocol for Testing Microbiological Water Purifiers or NSF P231) are examples of demonstrating adequate disinfection before or after the system.
1.3 Alternate materials, design, and construction
While specific materials, design, and construction may be stipulated in this Standard, systems that incorporate alternate materials, designs, and construction may be acceptable when it is verified that such systems meet the applicable requirements.
1.4 Treatment train
A system that contains multiple, sequential treatment technologies for a performance claim under this
Standard shall meet the applicable requirements as described in Annex C.
2 Normative references
The following documents contain requirements that, by reference in this text, constitute requirements of this Standard. At the time of publication, the indicated editions were valid. All of the documents are subject to revision and parties are encouraged to investigate the possibility of applying the recent editions of the documents indicated below. The most recent published edition of the document shall be used for undated references.
3 Definitions
Terms used in this Standard that have a specific technical meaning are defined in NSF/ANSI 330.
4 Materials
4.1 Materials in contact with drinking water
4.1.1 POE drinking water treatment units shall conform to the protocol in NSF/ANSI 61.
4.1.2 POU drinking water treatment units shall conform to the protocol in this Section.
4.1.3 Acceptance criteria
4.1.3.1 Materials in contact with drinking water shall not impart levels of target compounds or tentatively identified compounds (TICs) that exceed the total allowable concentration (TAG), maximum contaminant levels (MCL), or maximum acceptable concentration (MAC) criteria specified in NSF/ANSI 61, Annex D, Table D. 1. Any extractable contaminants not listed in the referenced Tables shall be reviewed and shall not exceed criteria developed in accordance with NSF/ANSI 61, Annex A.NSF ANSI 44 pdf download.