January 01, 2018
Hardness. We measured 13 grains of hardness at the office on December 28th, and (based on pumping) it has averaged 12 grains throughout the month (a grain is approximately 17.1 milligrams per liter). In January, we expect hardness to range from 11 to 14 grains.
Average Household Usage: For the Month of December 2017, the average household usage was just under 41,000 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.