NSF ANSI 55:2018 pdf free download – Ultraviolet Microbiological Water Treatment Systems
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 (MCLs), 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. 4.1.3.2 TIC identification and quantitation shall be conducted in accordance with Section
4.3.1 .2. Additional TIC identification and quantitation shall 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 4.3.1 .2 is inconclusive. When possible, the product manufacturer shall 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 4.3.1 .2. NOTE — Manufacturers may not be privy to formulation information, so they may not be able to assist a testing laboratory to identify a standard for the compound that extracted. Refer to Section 4.3.1.2 when the manufacturer does not have material formulation information.
4.1.3.4 Whole-system or component assembly extraction testing may be waived if components, when separately tested, meet the requirements of this Standard and are assembled in a manner that does not introduce any new components or materials, increase the surface area-to-volume ratio of previously evaluated components, or present potential concern based on cumulative factors. The reported extractable concentrations for components shall be arithmetically added to ensure that the whole-system or component assembly meets the allowable levels in accordance with Tables 4.1 , 4.2, and 4.3 and Annexes A, D, and E of NSF/ANSI 61 .
4.2 Materials evaluation
Complete formulation information on any material not certified as specifically compliant with the sections of the US Code of Federal Regulations, Title 21 , listed in Table 4.4, shall be reviewed to determine whether the material presents a health effects concern in contact with drinking water and to assess the material’s potential for contributing contaminants to the drinking water. As a minimum level of information for those materials requiring submission of formulation information, the complete chemical identity and proportion by weight (in some cases approximate weights or proportions may suffice) and ingredient sources of supply shall be provided.