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hard-water soap

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  • Hard water — is the type of water that has high mineral content (in contrast with soft water ). Hard water minerals primarily consist of calcium (Ca2+), and magnesium (Mg2+) metal cations, and sometimes other dissolved compounds such as bicarbonates and… …   Wikipedia

  • hard water — water that contains magnesium, calcium, or iron salts and therefore forms a soap lather with difficulty. * * * Water that contains mineral salts of calcium and magnesium, principally as bicarbonates, chlorides, and sulfates, and sometimes iron.… …   Universalium

  • hard water — noun water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap • Ant: ↑soft water • Hypernyms: ↑water, ↑H2O * * * water that contains magnesium, calcium, or iron salts and therefore forms a… …   Useful english dictionary

  • hard water — noun water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap Ant: soft water …   Wiktionary

  • soap and detergent — ▪ chemical compound Introduction       substances that, when dissolved in water, possess the ability to remove dirt (detergent) from surfaces such as the human skin, textiles, and other solids. The seemingly simple process of cleaning a soiled… …   Universalium

  • Water softening — A water softener reduces the dissolved calcium, magnesium, and to some degree manganese and ferrous iron ion concentration in hard water.These hardness ions cause three major kinds of undesired effects. Most visibly, metal ions react with soaps… …   Wikipedia

  • Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …   Wikipedia

  • hard — /hahrd/, adj., harder, hardest, adv., harder, hardest, n. adj. 1. not soft; solid and firm to the touch; unyielding to pressure and impenetrable or almost impenetrable. 2. firmly formed; tight: a hard knot. 3. difficult to do or accomplish;… …   Universalium

  • hard — hard1 W1S1 [ha:d US ha:rd] adj comparative harder superlative hardest ▬▬▬▬▬▬▬ 1¦(firm to touch)¦ 2¦(difficult)¦ 3¦(work/effort)¦ 4¦(full of problems)¦ 5 be hard on somebody 6 be hard on something 7 do something the hard way …   Dictionary of contemporary English

  • Water quality — A rosette sampler is used to collect samples in deep water, such as the Great Lakes or oceans, for water quality testing. Water quality is the physical, chemical and biological characteristics of water.[1] It is a measure of the condition of… …   Wikipedia

  • hard — hard1 [ hard ] adjective *** ▸ 1 firm & not easy to break ▸ 2 difficult to do ▸ 3 full of problems ▸ 4 strong & not frightened ▸ 5 unkind/cruel ▸ 6 with much physical force ▸ 7 about water ▸ 8 winter/frost: severe ▸ 9 facts, etc.: can be proved ▸ …   Usage of the words and phrases in modern English

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