Tech. Sgt. Richelle Rodriguez, 36th Medical Operations Squadron ambulance services non-commissioned officer in charge, adds an activating agent to a water sample to test the pH level Aug. 22, 2013, on Andersen Air Force Base, Guam. The 36th MDOS Bioenvironmental Engineering Flight Airmen digitally scan water samples at least once per month to measure pH levels, chlorine, fluoridation and to see if there are any harmful bacteria present. (U.S. Air Force photo by Staff Sgt. Melissa B. White/Released)
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