October 01, 2017
Hardness. We measured hardness at the office on October 29th and it was 20 grains. Based on our total pumping in October, it averaged 27 grains for the month. A grain is approximately 17.1 milligrams per liter. We expect hardness to drop in November, as our pumping diminishes, to about 21 grains
Average Household Usage: For the Month of October 2017, the average household usage was just under 4,800 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.