GPG

abbreviation for ‘grain per gallon’.

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Hoschton, GA 30548
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Metro Atlanta
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Outside Metro Atlanta

Definitioner

Grain Per Gallon: (gpg) a common basis for reporting water analyses in the U.S. and Canadaone grain per U.S. gallons equals 17.12 milligrams per liter or parts per million. one grain per British gallon equals 14.3 milligrams per liter or parts per million.
Grain: (gr.) a unit of weight equal to 1/7000th of a pound, or 0.0648 gram.