It may sound odd to describe water as being hard. All this means, however, is that hard water has a higher than normal amount of magnesium and calcium. You can know you have hard water if there are mineral deposits left behind in the dish rack or there is a film on the inside of glassware. Because of the problems it causes, most homeowners don't want hard water. When you wash clothes with hard water, it causes clothes to wear out more quickly.
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