SpaChoice 1-Pound 2-Pack Premium pH Increaser for Hot Tub, 100% Sodium Carbonate, Made in USA

"Spa Choice pH Increaser raises the pH level of your spa water. Spa water should be maintained at a pH of 7.2 - 7.8. Test water frequently with a test kit or test strip to ensure the spa water pH levels remain in the recommended range. Spa Choice pH Increaser is compatible with all sanitizers including bromine, chlorine and biguanide. 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. DIRECTIONS: 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. Always wait 30 minutes between doses and test water before each addition of this product. "