Posted by Tyra on Saturday, March 8, 2008 at 7:31pm.
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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