This standard describes sodium chloride in the forms of rock, vacuum-granulated, compressed vacuum-granulated, solar, and comopressed solar salt for use in the recharging of cation-exchange materials in water supply service for softening municipal and industrial potable water, wastewater, and reclaimed water supplies. Additionally, sodium chloride is used in the recharging of anion-exchange materials for nitrate removal or de-alkalization of municipal and industrial supplies.