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The 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).
Learn how to measure and understand hard water in grains per gallon (gpg) and parts per million (ppm). Find out how to choose and use a water softener based on your water hardness and capacity.
Learn how grains per gallon measures water hardness, its causes and consequences, and how to address it with water softeners. Find out how to convert grains to ppm and how to size your water softener correctly.
4 Μαρ 2024 · The Water Hardness Conversion Calculator facilitates conversions between different units of water hardness, including parts per million (ppm), grains per gallon (gpg), French degrees (°f), and German degrees (°dH).
Hard water is water that contains high levels of calcium and magnesium, measured in grains per gallon (gpg). Learn how hard water affects your home, health, and appliances, and how to test and treat it with a water softener.
1 grain/US gallon = 0.958 German degrees. Total dissolved solids (TDS) refers to a measure of all inorganic solids dissolved in the water. This means that it will measure ions that contribute to water hardness, like calcium, but also those that do not, like sodium.
There are two basic water hardness measurements: grains per gallon and parts per million. According to the Encyclopaedia Britannica, grains per gallon is a measurement that originated as a measure of the weight of a dry wheat kernel. This ancient measurement is roughly equivalent to 1/7000 of a pound.
