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Definition of Water softener
1. Noun. A substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power.
Definition of Water softener
1. Noun. A device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin. ¹
¹ Source: wiktionary.com