Water Hardness

°dH (German degree of hardness, 10 mg CaO/l)
°fH (French degree of hardness, 10 mg CaCO3/l)
°e (English degree of hardness, grain CaCO3/gal(UK))
ppm (mg CaCO3/l)
mmol/l (millimol per litre)
mval/l (millival per litre)
gr/gal(US) (grain CaCO3/gal(US))
mg CaO/l
mg CaCO3/l
mg Ca2+/l
mg Mg2+/l


The results have been rounded to significant digits.

The hardness of water is a measure of the content of calcium and magnesium in water.  Water can be classified in relation to their degrees of hardness to water quality – soft, Moderate soft, slightly hard, hard, very hard

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