Leisure Time Spa Down is an easy to use granular product that lowers water pH and alkalinity. It is important to maintain your spa or hot tub water’s pH between 7.2 and 7.8. High pH (above 7.8) can cause scaling, ineffective sanitizing, or cloudy and colored water. Leisure Time Spa Down is compatible with chlorine, bromine and biguanide sanitizers. Use as needed to adjust pH levels.