Ion Exchange and boiler water chemists frequently report the concentration of hardness as "Grains per Gallon (as calcium carbonate equivalents)". One Grain per U.S. Gallon (as calcium carbonate) is equal to 17.1 ppm (as calcium carbonate).
Ion Exchange and boiler water chemists frequently report the concentration of hardness as "Grains per Gallon (as calcium carbonate equivalents)". One Grain per U.S. Gallon (as calcium carbonate) is equal to 17.1 ppm (as calcium carbonate).
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