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hard water

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WordReference Random House Unabridged Dictionary of American English © 2025

hard′ wa′ter,

Chemistrywater that contains magnesium, calcium, or iron salts and therefore forms a soap lather with difficulty.

'hard water' also found in these entries (note: many are not synonyms or translations):

boron carbide - bronze - detergent - fur

Forum discussions with the word(s) "hard water" in the title:

It runs off the soil just like water off a hard clay pot
Last minute they are trying to pour water over our hard work
soft/hard water
water is hard or hard water

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