hard water

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hard wa·ter

water containing ions, such as Mg2+ and Ca2+, that form insoluble salts with fatty acids so that ordinary soap will not lather in it.

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.
Water with a high content of calcium and magnesium salts—e.g., carbonates and sulphates—which may interfere with certain lab tests

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.

hard wa·ter

(hahrd wawtĕr)
That containing ions, such as Mg2+ and Ca2+, which form insoluble salts with fatty acids so that ordinary soap will not lather in it.
References in periodicals archive ?
Table IA: Concentration levels in mg/l of Ca and Mg, hardness of water, and ratio of Ca to Mg in Decatur County waters Sample A: Lake and Pond Site [[Ca.
Growth in the soft drinks industry, hardness of water, industrial growth in Asia, increasing scope of water treatment chemicals, focus on innovations to produce efficient and safe chemicals remain the key drivers for the water treatment chemicals in soft drink market.
Sources of water, hardness of water, water treatment and conditioning for municipal and industrial purpose.
This research indicates that the hardness of water may be one of the characteristics of processing water that should be monitored by poultry processors.