Grains per gallon

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).

Usage

Calcium and magnesium ions present as sulfates, chlorides, carbonates and bicarbonates cause water to be hard. Water chemists measure water impurities in parts per million (ppm). For understandability, hardness ordinarily is expressed in grains of hardness per gallon of water (gpg). The two systems can be converted mathematically.

Measurement of water hardness

According to the Water Quality Association...

soft: 0-3.5 grains per gallon (gpg),

moderate: 3.5-7.0 gpg,

hard: 7.0-10.5 gpg, and

very hard: over 10.5 gpg

Conversions

See also

References

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