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a device that removes minerals, such as calcium and magnesium, from hard water to make it soft and more suitable for household use
What is a "water softener"?
A water softener is a device that removes minerals, such as calcium and magnesium, from hard water. These minerals can cause problems like scaling in pipes and appliances, as well as making soap less effective. A water softener works by using a process called ion exchange, where hard minerals are replaced with softer minerals, typically sodium. The result is water that is gentler on plumbing, appliances, and skin. Water softeners are commonly used in homes with hard water to improve the quality of water and extend the lifespan of household appliances.
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
water softener