April 07, 2019
Hardness. We measured 32 grains of hardness at the office for the month of July. Reading was taken on July 27, 2020.
Average Household Usage: Average household usage was 9,649 gallons for the month of July 2020; it was 8,589 gallons for June 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.