During the use of an ionic foot bath the color of the water changes. The various colors can tell you what area the body may be detoxing. While immersing your feet in the water + and - ions are emitted by the machine, which reenergize the body. The response of a rebalanced body is to excrete any excess toxins not only DURING but also AFTER treatment. The entire process takes 30-40 min. and is completely safe to use.