hard water

noun

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

hard water

1. Water in which dissolved minerals make it difficult to produce a lather with soap.

Hard water is usually associated with well water in regions where the rocks contain a large proportion of iron-bearing minerals.

Example Sentences

“Soap doesn’t lather as well with hard water,” said Campbell.

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She recommends it for tackling hard water stains, accidental hair dye stains, Kool-Aid stains on counters and stubborn rings around kitchen burners.

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Yet stalagmites offer new insights into climate fluctuations because the German researchers could examine the isotopic composition of oxygen in a southern German stalagmite that had been formed from hard water.

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In areas with hard water, repeated irrigation deposits minerals into the soil and onto the sides of the container.

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As they evaporate and refill over time, Beeler said an alkali pool can be distinguished by a white ring — similar to hard water stains — that forms on exposed soil and rocks.

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