grain per gallon

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 the Clark degree; see degree4.

Dictionary of units of measurement. 2015.

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