Last Updated
：2025/11/20
water softener
（ plural ）
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A device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin.
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water softener
The plumber installed a new water softener that uses an ion-exchange resin to remove calcium and magnesium from our hard water.
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The plumber installed a new water softener that uses an ion-exchange resin to remove calcium and magnesium from our hard water.
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