| http://www.w3.org/ns/prov#value | - In accordance with these objects, there is provided a method of producing high purity water using a reverse osmosis membrane system having enhanced membrane life, the method comprising providing a feedwater to be purified and treating the feedwater with a weak acid cation resin for purposes of dealkalization to remove ions including bicarbonate, carbonate, sulfate and nitrate ions to provide a dea
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