difference between hardness and total hardness of water
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Water hardness is typically reported in grains per gallon, milligrams per liter (mg/l) or parts per million (ppm). One grain of hardness equals approximately 17.1 ppm (mg/L) in TDS. ... Hardness means hard waterTDS means total dissolved solids,hardness is due to calcium and magnesium salts. So both are same
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