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water softener

noun
1.
any of a group of substances that when added to water containing calcium and magnesium ions cause the ions to precipitate or change their usual properties: used in the purification of water for the laboratory, and for giving water more efficient sudsing ability with soap.
Also called softener.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for water softener

water softener

noun
1.
any substance that lessens the hardness of water, usually by precipitating or absorbing calcium and magnesium ions
2.
a tank, apparatus, or chemical plant that is used to filter or treat water to remove chemicals that cause hardness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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