Staff Sgt. Paul Bauer, 9th Civil Engineer Squadron water and fuels system maintenance journeyman, oversees the trickling filter, which is used as a bio-filtration system, at the waste water facility on Beale Air Force Base, Calif., March 5, 2013. The facility safely treats the waste water on Beale and provides clean drinking water. (U.S. Air Force photo by Airman 1st Class Bobby Cummings/Released)
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