What is ?hard? water?
Hardness in drinking water is caused by two nontoxic chemicals-usually called minerals ? calcium and magnesium. If either of these minerals is present in your water in substantial amounts, the water is said to be ?hard,? because making a lather or suds for washing is ?hard? (difficult) to do. Thus cleaning with hard water is difficult. Water containing little calcium or magnesium is called ?soft? water. Water that does not contain enough calcium or magnesium may be ?too soft.?
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