NSF ANSI 44:2018 pdf free download – Residential Cation Exchange Water Softeners
4.1.3.2 TIC identification and quantitation shall be conducted in accordance with Section 4.3.1 .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 4.3.1 .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 4.3.1 .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.
4.1.3.3 Unknown contaminants detected by GC/MS analysis for which identification is unable to be made after performing the steps in Section 4.3.1 shall be reported in accordance to Section 4.1 .4.2.
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.
4.2.3.3 A minimum sample volume of 2 L shall be collected at each sample point. If the water-holding volume of the product is greater than 2 L, the entire volume shall be collected in a suitable collection vessel, and a 2 L subsample obtained from this volume. If the water-holding volume of the product is less than 2 L, sufficient products shall be exposed to provide the required 2 L volume of extractant water. The maximum number of samples exposed shall not exceed 1 6 with 1 25 mL of extractant water drawn from each sample. If the components with a water-holding volume that is less than 250 mL and is able to be identified as one that will only occur once in the flow path of dispensed treated water (such as diverters, faucets, RO shutoff valves, or specialty components) then a volume of 250 mL shall be drawn from each sample using a maximum number of eight samples.