The difference between Hard water and Water softener
When used as nouns, hard water means water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap, whereas water softener means a device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin.
check bellow for the other definitions of Hard water and Water softener
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Hard water as a noun (chemistry):
Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.
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Water softener as a noun:
A device which reduces the calcium and magnesium concentration of hard water by passing it through an ion exchange resin.