NSF ANSI 401:2020 pdf free download – Drinking Water Treatment Units – Emerging Compounds / Incidental Contaminants
1.2 Scope
The point-of-use (POU) and point-of-entry (POE) systems addressed by this Standard are designed to be used 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 substances that are at very low, yet measurable concentrations, but not at definitive concentrations of known health concern. These substances may be soluble or particulate in nature, but their presence, even at very low concentrations, may influence public acceptance / perception of the drinking water quality. The systems addressed by this Standard are not intended for reducing these specific substances at higher concentrations that may have a known acute or chronic health effect. It is recognized that a system may be effective in reducing one or more of the emerging compounds / incidental contaminants listed in this Standard, but systems are not required to control all. 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.
1.5 Minimum requirements
This Standard establishes minimum requirements. A system as defined in this Standard shall meet the applicable requirements of Sections 4, 5, 6, and 8, and at least one performance claim as described in Section 7. A component as defined in this Standard shall meet the requirements of Section 4 and 8. If the component is pressure-bearing, it shall also meet the applicable requirements of Section 5. A commercial modular system as defined in this Standard shall meet the applicable requirements of Sections 4, 5, 6, and 8, and at least one performance claim as described in Section 7. Manifolds of commercial modular systems shall meet the requirements of Sections 4, 5 (if pressure bearing), and 8, and shall be evaluated as stand-alone components. Manifolds shall have a minimum internal diameter such that the water velocity in the manifold will not exceed 3 m (1 0 ft) per second (which can be calculated based upon the system flow rate and the manifold internal diameter). Individual modular elements evaluated as a manifold and modular element combination shall meet the applicable requirements of Sections 4, 5, 6, and 8, and at least one performance claim as described in Section 7.
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 (TAC), maximum contaminant levels (MCL), or maximum acceptable concentration (MAC) criteria specified in NSF/ANSI/CAN 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/CAN 61 , Annex A.
4.1.3.2 TIC identification and quantitation shall be conducted in accordance with Section 4.5.1 .2. Additional TIC identification and quantitation should be verified using a standard of the compound in question or an alternate approved analytical method. Additional TIC identification and quantitation is recommended when the contaminant is a health risk or when the ‘probability-based matching’ process in Section 4.5.1 .2 is inconclusive. When possible, the product manufacturer should assist and support the testing laboratory in the identification of a Standard for the compound and an appropriate analytical method, if applicable, so that confirmatory identification and quantification can be performed. If a standard and an adequate alternative analytical method are not available to verify the identification and quantitation of the compound, the TIC shall be evaluated according to Section 4.5.1 .2.