Grain per gallon

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The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).

Source: https://en.wikipedia.org/wiki/Grain_per_gallon
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Tags:
Calcium
Calciumcarbonate
DGH
Gallon
Grainmass
Litre
Magnesium
Partspermillion