This product is used to raise the pH in spa water. The water in the spa should be maintained at a pH of 7.2-7.8 and total alkalinity from 80-140 ppm. Test water frequently with suitable test kit to ensure proper pH is maintained. This product is compatible with all sanitizers including bromine, chlorine and biguanide. This product should be used if pH is below 7.2. 1. Turn on air blower, jets or filter system. 2. Premix 1 oz. of this product with water in plastic pail and add diluted product to spa. 3. Retest water after 30 minutes. 4. Follow steps 1-3 until pH and total alkalinity are in the range of 7.2-7.8 and 80-140 ppm respectively.