Hardness (Of Water) 03


Hardness (Of Water) 03 : The hardness of water is due principally to the calcium and magnesium ions present in the water and is independent of the accompanying acid ions. The total hardness is measured in terms of parts per million of calcium carbonate or calcium and sometimes equivalents per million of calcium. For hardness tests, See: API RP 13B. (Bul 10C, Bul D11).
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