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hard water

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hard water

–noun
water that contains magnesium, calcium, or iron salts and therefore forms a soap lather with difficulty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Cultural Dictionary

hard water

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

Note: Hard water is usually associated with well water in regions where the rocks contain a large proportion of iron-bearing minerals.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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