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Water Measurements

Hardness. We measured 18 grains of hardness at the office for the month of March. Reading was taken on March 25, 2020.

Average Household Usage: Average household usage was 3,920 for the month of March 2020; it was 4,968  gallons for February 2020.

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).

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).

How many mg/l in 1 grain per gallon? The answer is 14.253768.

1 gallon of water = 8.34 pounds.