dGH
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Degrees of General Hardness (dGH) is a unit of water hardness, specifically of General Hardness.
General Hardness is a measure for the number of calcium and magnesium cations per volume of water. 1 dGH corresponds to 10 mg of calcium oxide or magnesium oxide per litre of water.
-note: In water testing, the paper strips measure hardness in parts per million(ppm) one part per million is one milligram (mg) of calcium per litre of water.
10ppm = 1 dGH
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