Specifications include, but are not limited to: a. General: The material shall be homogenous and in granular form. b. Foreign Material: The material shall be free from dirt, fibers, lint, chips, trash, or other foreign matter. c. Fineness: Rock salt shall be of such fineness that 100 percent of it shall pass a ¾ in. (19mm) sieve and not more than 5 percent of it shall pass a No. 60 (0.25mm) sieve. d. NaCI Content: 96 percent minimum NaCI content by weight (dry basis). pH of Solution: 5 - 9.5. e. Impurities: The sodium chloride shall contain no substances in quantities capable of producing deleterious or injurious effects on the health of those consuming the water softened by a cation-exchange material that has been properly regenerated with sodium chloride or capable of causing water so softened to fail to meet the requirements of the USEPA drinking water regulations. In addition, the sodium chloride shall contain no constituents that, if released into cation-exchange-softened water after regeneration and rinsing, will impair the usefulness of the water for domestic consumption.
