Spa PH Decreaser

Decrease pH level to ideal range

Natural Chemistry’s Spa pH Decreaser lowers the pH of water in spas and hot tubs. Spa and hot tub water should be maintained between a pH of 7.2 and 7.6. When pH is too high (above 7.6), water becomes uncomfortable to bathers, sanitizers lose their efficiency, water may become cloudy and scale forms more readily.



– Brings pH level to an ideal range
– Reduces skin and eye irritation

2 lb. bottle


1. Test spa water for pH level.
2. Compare pH test results to chart below to determine appropriate amount of Natural Chemistry Spa pH Decreaser 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, adjust if necessary.

Dosage Chart 
(All values are in dry weight)

Spa VolumepH 7.2 – 7.6pH 7.6 – 7.8pH 7.8 – 8.0pH 8.0 – 8.4Above pH 8.4
200 galnot req.0.5 tsp0.75 tsp1.5 tsp2 tsp
400 galnot req.0.75 tsp1.5 tsp3 tsp3.5 tsp
800 galnot req.1.5 tsp3 tsp6 tsp7 tsp

NCI threaded safety cap = 2 teaspoons or 1/2oz of this product