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Published April 29, 2012, 12:00 AM

Tom Schaefer


Tom Schaefer of ETS UV Technology in Beaver Dam, Wis., describes how a water-treatment system neutralizes parasites using ultraviolet light. Four of the devices pictured will be installed at the Edge­water next week. (Bob King / rking@duluthnews.com)
Read the article: Edge waterpark in Duluth to install new equipment to prevent waterborne illness