water-softener

water softener

noun
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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World English Dictionary
water softener
 
n
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

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