Additional Details ------------------------------ Directions: 1. Check the current water hardness level of your spa or hot tub. 2. Determine the amount of Leisure Time CB Calcium Booster needed to reach the desired hardness level (150-400 ppm). 3. Add the appropriate amount of the product to your spa or hot tub, ensuring it is compatible with your sanitizer (chlorine, bromine, ozone, or biguanide). 4. Monitor the water hardness level to ensure it remains within the recommended range.