Although less than 2% of the nation's drinking water plants use membranes for filtration, Manitowoc Public Utilities in Wisconsin and the Kennewick Public Works Department in Washington are using the technology to produce additional clean water without significant additional expense. Located in one of the state's highest-growth areas, the Milwaukee suburb of Manitowoc was treating 10 mgd with slow sand filtration. To keep pace with population growth, the utility decommissioned the filters and built a new plant that uses submerged membranes to purify water.
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