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Water Measurements

Hardness. We measured hardness at the office on August 28th and it was 27 grains. Based on our total pumping in August, it averaged 25 grains. A grain is approximately 17.1 milligrams per liter. We expect hardness to remain at this level through the month of September.

Average Household Usage:  For the Month of August 2017, the average household usage was just under 7,200 gallons.

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.