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The calcium (as calcium carbonate) in hard water replaces the sodium on the fatty acids of the soap causing them to precipitate as a sticky scum. This deposits soap scum on the things being washed and causes the formation of "bathtub ring" on bathtubs, sinks, etc.

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โˆ™ 2016-03-22 12:09:22
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Q: Why hard water consumes a lot of soap?
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