hard water


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Related to hard water: water softener

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 ?
For that reason we are now embarking on a pilot trial to investigate whether installation of a domestic water softener around the time of birth can prevent skin barrier breakdown and eczema in those living in hard water areas.
hard water and hair and the sampling technique used was non-probability, purposive, Randomized Control Trial (RCT).
In soft, moderately hard, and hard water, the proportion of silver in the ionic fraction, which is considered the most bioavailable, was likely reduced below that causing a toxic effect.
It's estimated that hard water is found in more than 85 percent of the United States.
Hard water which contains plenty of magnesium and calcium may protect against heart and circulatory diseases, according to a Finnish study.
People who drink hard water may have a greater protection against heart disease.
Super Shine-All delivers wetting action, penetrates and emulsifies dirt, suspends and holds soil, works in hard water, and has a neutral pH that will not harm floor finishes.
A tube like a long, hard water hose was squeezed into my throat until I wanted to vomit.
Prior to mixing, acidic and hard water should be treated with soda ash to a pH of 8.
All have very hard water and drink large amounts of water daily.