Bioenvironmental Engineering Flight ensures installation water quality
Senior Airman Alexander Delfs, 436th Aerospace Medical Squadron bioenvironmental engineering journeyman, examines water chemistry test results on a colorimeter Nov. 16, 2016, at an aircraft watering point on Dover Air Force Base, Del. Water testers are able to monitor multiple chemical concentrations with a colorimeter, including pH, chlorine and fluoride. (U.S. Air Force photo by Senior Airman Aaron J. Jenne)