Asked by Tyra

How can soap make soft water from hard water? What objections are there to using soap for this purpose?

Answers

Answered by DrBob222
The only way I know of is to use enough soap to precipitate all of the "hard" stuff in hard water; namely, the calcium and magnesium salts (primarily) with added amounts of iron, manganese, etc. This forms a soap scum which floats on top of the water. Frankly, I've never heard of using soap to "make water soft." There may be other ways of which I'm unaware.
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