Staff Sgt. Charles Johnson, 35th Civil Engineer Squadron water and fuels systems maintenance craftsman, drips Phenol Red into a test tube Jan.20 at the water treatment laboratory. Phenol Red is a chemical used to check the acidity level of water. The 35th CES water utilities flight checks the pH of water after treatment. Further testing is conducted by the 35th Medical Group Biohazard Flight. (U.S. Air Force photo/Staff Sgt. Phillip Butterfield)
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