Grain Per Gallon (gr/gal or gpg)


Grain Per Gallon (gr/gal or gpg) :

A traditional unit measuring the hardness of water. Water is "hard" if it contains dissolved minerals such as calcium or magnesium salts. 1 gpg is equivalent to about 17.118 milligrams per liter (mg/L). This unit is also called theClark degree; See: Degree [4]

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