DKH

{{Lowercase title}} {{other uses}} '''Degrees of German carbonate hardness''' ('''°dKH''' or '''{{not a typo|°KH}}'''; the dKH is from the German ''deutsche 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. As a unit 1 dKH is the same as 1 °dH which is equal to approximately 0.1786 mmol/L or 10.02 milligrams (mg) of calcium oxide per litre of water, i.e. 17.86 ppm.{{citation needed|date=March 2023}}

The measurements of total hardness (German ''Gesamthärte'' (GH)) and carbonate hardness (German ''Karbonathärte'' (KH)) are sometimes stated with units dKH and dGH to differentiate them from one another, although in both cases the unit they are measured in is German degrees (°dH).{{citation needed|date=March 2023}}

==See also== {{Portal|Water}} *Carbonate hardness *Hard water *dGH

==External links== *[http://www.thekrib.com/Plants/CO2/hardness-larryfrank.html Water Hardness definitions] *[https://www.cactus2000.de/uk/unit/masswas.php Convertor for Hardness of water] *[https://www.corrosionpedia.com/definition/1071/temporary-hardness What is Temporary Hardness]

Category:Water chemistry Category:Units of chemical measurement Category:Water quality indicators

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