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Re: potassium ion exchange

	I seem to recall that the CaCO3 concentration in the water was
about 300 ppm.  If so, the Ca++ concentration would be 40/100 of that,
or 120 ppm.  Potassium is singly charged, and has atomic weight about 39,
so the concentration of K+ would be 120 x 78/40 ppm, which is a lot.

Paul Sears        Ottawa, Canada