Grainger has water softener salt. Potassium Chloride Pellets are compressed contain a minimum of 98.1% potassium chloride and are virtually 100% water soluble. Pellets can be used in softener brine tanks and are compatible with softener components and resins. Solar Salt is harvested, dried and screened for commercial use. System saver II pellets remove substantially more iron from resin beads during the regeneration cycle than other pellets.