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hard water
(redirected from Hardness of water)

    Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
hard water
Etymology: AS, heard + waeter
water that contains certain cations, particularly calcium and magnesium, that precipitate with soap solutions. The term is generally applied to tap water, and the degree of hardness varies with the source and previous treatment.
hard water
Water with a high content of calcium and magnesium salts–eg, carbonates and sulfates, which may interfere with certain lab tests. See Mineral water, Spring water; Cf Soft water.


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