Leisure Time Spa Balance Spa Up pH Increaser (30410A) - 22339A Always maintain the pH of your spa water between 7.2-7.8. A low pH reading (below 7.2) can cause equipment corrosion or scale formation. Compatible with all sanitizers including chlorine and biguanide For more than 25 years, Leisure Time has been the premier name in spa water care Adjusts water pH and alkalinity upwards Fast-dissolving granular product