SpaGuard pH Decreaser ( 1 lb 6 oz)

pH Decreaser

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- For lowering pH levels
- Safer option to store and handle than liquid muriatic acid 
- Improves swimmer comfort 

SpaGuard pH Decreaser lowers the pH of water in spas and hot tubs.  The pH should be maintained at 7.2 to 7.6 (as measured by an accurate test method).  SpaGuard pH Decreaser is a dry granular product which is safer and easier to use than liquid acids. 

Product Dosage

- Use all level measurements 1 capful = 2 teaspoons; 3 teaspoons = 1 tablespoon

 Spa Capacity(gallons) 7.2-7.6 pH 7.6-7.8 pH 7.8-8.0 pH  8.0-8.4 pH 8.4 pH
200 Not Needed 0.5 tsp
0.75 tsp
1.5 tsp 2 tsp
Not Needed
0.75 tsp
1.5 tsp
3 tsp 3.5 tsp
Not Needed
2 tsp
4 tsp
7.5 tsp
9 tsp


  1. Use an accurate test method to determine pH
  2. Use the chart above and the results of the pH test to determine the required amount of SpaGuard pH Decreaser needed to adjust the pH to maintain a reading of 7.2 to 7.6
  3. Be sure the spa's total alkalinity reading is at least 125 ppm before adding this product
  4. With the pump running operating, sprinkle this product into the the water when the spa is not occupied.  Let the pump circulate for 30 minutes to thoroughly mix the product.  In units with aerators, the pump should be operating and the aerator OFF prior to application of the product
  5. Retest pH and adjust as necessary.  Be sure to consult chart for correct quantity to add based on the current pH of the spa


-Sodium Bisulfate: 93.2%
-Other Ingredients: 6.8 %