1. Test spa water for pH level.
2. Compare pH test results to chart on bottle to determine appropriate amount of Natural Chemistry Spa pH Increaser necessary to make adjustment.
3. With the spa not in use and circulation pump operating, add required amount directly into spa water. Continue circulating water a minimum of 30 minutes.
4. Retest, and adjust if necessary.
Sodium Hydrogen Carbonate 100%
This product is designed for use in any hot tub or spa with low pH.