DGH 842185 196039737 2008-03-05T14:26:47Z Jspreadborough 5541498 /* External links */ {{lowercase|title=dGH}} '''Degrees of General Hardness''' (dGH) is a [[Units of measurement|unit]] of [[Hard water|water hardness]], specifically of General Hardness. '''General Hardness''' is a measure for the number of [[calcium]] and [[magnesium]] [[ion|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 == External links == *[http://www.aquarticles.com/articles/management/Hardy_Water_Chemistry.html Some Basic Water Chemistry] [[Category:Units of measure]] {{chem-stub}}