Granular product gently adjusts water pH and alkalinity upward. Best used in larger spas and in commercial spas. As Needed:1. Determine amount to use according to bottle label.2. Make sure equipment is OFF.3. Add applicable amount to the spa water.4. Turn on circulation system for 1-3 hours.5. Retest water after 3 hours.6. If pH is still below 7.2, repeat steps 1-5.Tips: For best results, dissolve granular products first by adding to a small, plastic pail filled with water. Then, apply the solution to the spa water. Compatible With: Chlorine, bromine and biguanide sanitizers. Advantage: Use as part of the Simple Spa Care Program.