NSF ANSI 401:2020 pdf download.Drinking Water Treatment Units -Emerging Compounds /Incidental Contaminants.
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 I 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.
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, designs, and construction
While specific materials, designs, 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 stated herein.
1.4 Chemical and mechanical reduction performance claims
1.4.1 All NSF/ANSI 401 performance claims shall be verified and substantiated by test data generated under the requirements of NSF/ANSI 401.
1.4.2 When performance claims are made for substances not specifically addressed in the scope of this Standard, or for substances not specifically addressed but falling under the scope of NSF/ANSI 401, such claims shall be identified as not specifically addressed in the Standard.
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 (10 It) 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.
1.6 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 N-3.NSF ANSI 401 pdf download.