degrees of water hardness

degrees of water hardness
dGH (water hardness expressed in degrees of hardness. 0-4 is very soft, 5-8 soft, up to 30 which is extremely hard water). Note that different countries use different measures: 1 English (Clark) degree is 14.3 p.p.m. calcium carbonate, 1 American degree is 17.1 p.p.m. calcium carbonate and 1 French degree (fh) is 10.0 p.p.m. calcium carbonate. However 1 German degree (dh) is 17.9 p.p.m. calcium oxide. Confusingly the German dh is used generally for degrees of hardness

Dictionary of ichthyology. 2009.

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  • water hardness — the concentration of calcium and magnesium ions in water expressed as p.p.m. or mg/l of calcium carbonate equivalents. Water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water. Note that… …   Dictionary of ichthyology

  • Water — This article is about general aspects of water. For a detailed discussion of its properties, see Properties of water. For other uses, see Water (disambiguation) …   Wikipedia

  • hardness — water with a high mineral content, the name deriving from the fact that it is hard to develop a lather for cleaning. The concentration of calcium and magnesium ions in water is expressed as p.p.m. or mg/l of calcium carbonate equivalents. Soft… …   Dictionary of ichthyology

  • Hard water — is the type of water that has high mineral content (in contrast with soft water ). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and… …   Wikipedia

  • Carbonate hardness — is the measure of Calcium and Magnesium and other hard ions associated with carbonate (CO32 ) and bicarbonate (HCO3 ) ions contained in a solution, usually water. It is usually expressed either as parts per million (ppm or mg/L), or in degrees… …   Wikipedia

  • DH — (dh or dH)) hardness, expressed in degrees (Germany). 1 DH 17.86 p.p.m. Also used, confusingly, for water hardness generally as there are English, American and French measures too (see degrees of water hardness) …   Dictionary of ichthyology

  • degree — 1) 1/360 of a circle or 60 minutes. The symbol here and below is ° 2) 60 nautical miles, 69.05 statute miles or 111.12 km 3) a temperature unit (Celsius or Fahrenheit). Strictly 10°C is an actual temperature while 10C° is a range (from say 23 to… …   Dictionary of ichthyology

  • dGH — Degrees of general hardness (dGH) is a unit of water hardness, specifically of general hardness. General hardness is a measure of the concentration of metal divalent ions such as calcium and magnesium (Ca2+, Mg2+) per volume of water.… …   Wikipedia

  • DGH — 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… …   Wikipedia

  • dGH — water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water …   Dictionary of ichthyology

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