what are the units for degree of hardness of water
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Degrees of general hardness (dGH or °GH) is a unit of water hardness, specifically of general hardness. General hardness is a measure of the concentration of divalent metal ions such as calcium (Ca2+) and magnesium (Mg2+) per volume of water.
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The degree of hardness is expressed as parts per million (ppm).
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