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dKH

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This is an old revision of this page, as edited by 2603:3017:b97:0:9951:8779:6b2b:a2a1 (talk) at 23:30, 6 October 2022 (→External links: https://www.cactus2000.de/uk/unit/masswas.shtml to https://www.cactus2000.de/uk/unit/masswas.php). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

This article is about measurement of water hardness. For other uses, see DKH (disambiguation).


Degrees of carbonate hardness (dKH or °KH; the K is from the German Karbonathärte) is a unit of water hardness, specifically for temporary or carbonate hardness. Carbonate hardness is a measure of the concentration of carbonates such as calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) per volume of water. Specifically, 1 dKH is defined as 17.86 milligrams (mg) of calcium carbonate per litre of water, i.e. 17.86 ppm. Since a mole of calcium carbonate weighs 100.09 grams, 1 dKH is equivalent to 0.17832 mmol per litre.

dKH are the same as °fH, degrees of French hardness.

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