We use a state-of-the-art purification system for all baths, utilizing ultraviolet light, hydrogen peroxide, and ozone. Chlorine is not used in any bath. The entire water content of each tub passes through the sanitation system every twenty minutes. We perform bacterial cultures weekly on all tubs to ensure that all systems work properly. Often the result is drinking water quality. The source of the highly mineralized water used in the baths is a 900-foot deep well.