EIELSON AIR FORCE BASE, Alaska -- Staff Sgt. Brad Gurley from the Base Water Treatment Plant pours a chlorine reagent powder into a vile of water to test for free chlorine, which is a disinfectant. When the water turns pink, the disinfectant is present. This is part of a Water Analysis process. Water Analyis tests for the major elements, Chlorine, Floride, Phosphate, Maganese, Iron, and PH levels, among many others present in the base distrobution system. (U.S. Air Force photo by Senior Airman Rachel Walters)