Add the non-bromine, non-chlorine Sirona Simply Sanitizer to water at start-up, then test and use as needed to prevent bacteria from coming back. This liquid sanitizer formula oxidizes organics and removes oils to keep water crystal clear by utilizing stabilized hydrogen peroxide for a simply rejuvenating chlorine-free spa experience. Recommended to use this oxidizer with Sirona Simply Waterline Control and Sirona Simply Sanitizer to maintain healthy water.