| http://www.w3.org/ns/prov#value | - The filling ratio of the ion-exchange resin in the ion-exchange membrane is, generally, 5 to 95% by weight, preferably, 10 to 90% by weight and, particularly preferably, 20 to 60% by weight for easily permeating the medicinal ions and for improving the strength of the ion-exchange membrane, though the filling ratio may vary depending upon the percentage of voids of the porous film
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