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Milliequivalent
To simplify the calculation of ion exchange resin capacity, total dissolved ion concentrations are usually converted into equivalent concentrations of calcium carbonate, the most common source of dissolved ions in water. Resin capacity is normally given in ppm as CaCO3, or in grains per gallon as CaCO3 (7,000 grains = 1 pound). However, it may also be given as milliequivalents per liter (meq/L). Since calcium carbonate has a molecular weight of 100 and an equivalent weight of 50 (because calcium has a valence of two) ppm as CaCO3 can be converted to meq/L by dividing by 50. Thus, 1 ppm of CaCO3 = 0.02 meg/L