soft water

soft water

noun
water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap) [ant: hard water
WordNet® 3.0, © 2006 by Princeton University.
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Encyclopedia Britannica
Encyclopedia

soft water

water that is free from dissolved salts of such metals as calcium, iron, or magnesium, which form insoluble deposits such as appear as scale in boilers or soap curds in bathtubs and laundry equipment. See also hard water.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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