Natural water is typically not potable, and chemical treatment is often required to provide quality drinking water. Also, distribution equipment is required to transport and distribute drinking water from its source to consumers. NSF/ANSI 60 & 61 provide standards to ensure treatment chemicals and processing and distribution equipment are selected, designed, and utilized properly.

NSF/ANSI 60 establishes minimum health effects for chemicals, chemical contaminants and impurities added directly to drinking water from treatment chemicals. The standard covers coagulation and flocculation, softening, precipitation, sequestering, pH adjustment, corrosion/scale, and disinfection and oxidation chemicals.

NSF/ANSI 61 sets minimum health effect guidelines for the chemical contaminants and impurities imparted from products, components, and materials to drinking water systems. It does nor establish performance, taste and odor, or microbial support requirements.

The focus of NSF 61 is on the evaluation of contaminants and impurities imparted indirectly to drinking water from a range of materials utilized in treating, handling and distributing drinking water , such as process/filtration media, coatings and linings, joining and sealing materials, pipes, and mechanical devices.

These standards were developed as a request of the EPA in the 1980’s for a third-party consensus and certification program for direct and indirect water additives.

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