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Resin type water softeners usually use sodium chloride type salt to clean the resin. Potassium chloride can be used but it takes more of it and it is more expensive. The best type of salt to use is evaporated type salt. It is almost 100% free of any impurities like what is in rock/road salt. Impurities plug up the resin tank and may cause bridging in the brine tank as the salt will clump together. My parents had a salt type water softener for YEARS until they sold the house a couple years ago. AFAIK the new owners still use it.