Most adults have learned that water can be soft or hard. They have learned, too, that there is a connection between total hardness and water quality. Hard water reduces the power of your soap. In fact, hard water is often detected by noting the amount of soap required to form lather. Hard water may build up in hot water pipes and appliances, producing scale.
Hard Water Defined
Hard water is water that contains high levels of dissolved calcium, magnesium, and other mineral salts such as iron. The greater the amount of dissolved minerals in the water, the harder it is.
Total hardness is measured in grains per gallon (gpg) or parts per million (ppm). If water contains less than 3.5 gpg, it is considered soft water. If it contains more than 7 gpg, it is considered hard water. The American Society of Engineers’ water hardness classification table breaks it down this way.
* Soft: 0 to 3.5 gpg 0 to 60 ppm
* Moderate: 3.6 to 7 gpg 61 to 120 ppm
* Hard: 7.1 to 10.5 gpg 121 to 180 ppm
* Very Hard: More than 10.5 gpg more than 180 ppm
Making the Connection
Total hardness and water quality are connected. Hard water is...
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