Carl Johnson, Project Solutions Inc. lab technician and water treatment operator, tests the pH levels of a water sample during routine water tests at the waste water treatment facility on Ellsworth Air Force Base, S.D., April 26, 2012. The Ellsworth waste water treatment facility treats approximately 800,000 gallons of water a day. Before the water is legally allowed to go into the public system, the Ph levels must be neutral. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)
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