| http://www.w3.org/ns/prov#value | - Although capable of other important uses, this invention finds advantageous utility in the treatment of water to remove therefrom polyvalent metal ions such as calcium and magnesium by the exchange of sodium ions for such polyvalent metal ions and, by means of the same treating medium, namely, finely subdivided ion exchange resin particles, also provides the removal of chlorine, hydrogen sulfide,
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