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Water softener salt is used to improve water quality by removing the ions that make water hard. Salt based water softening is the most common and most effective method of removing the minerals that harden the water. The term hard water is used to describe water that contains high mineral content, usually in the form of calcium and magnesium. High calcium levels can also cause lime scale build up that block piping and can coat heating elements. Water softening is used in commercial and residential applications where these problems are avoided. Water softener salt is designed to remove specific anions (positively charged ions) from the water.