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Only use a whole house water treatment system if your home's water is unusually hard. Water is hard when it contains an excess of calcium, magnesium and other minerals. Hard water may have an unpleasant odor and will make it difficult for you to clean dishes, windows and clothes.
Water that measures over 10 "grains" can benefit from a whole house water treatment system. Water softeners make little difference for water that is contains under 10 grains of hardness.