pH Minus 7 lbs. - Swimming Pool and Spa Water pH Decreaser

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pH Minus 7 lbs. - Swimming Pool or Spa Water pH Decreaser 

Effectively lowers pH or Alkalinity in swimming pools or spas

95% Sodium Bisulfate, also known as dry acid.

Lower the pH levels in your pool or spa with pH Minus (pH Decreaser). This sodium bisulfate Pool and Spa pH Decreaser is highly effective and concentrated, containing 95% sodium bisulfate dry acid, ensuring great results!


  • Before Adding pH Decreaser
    • First establish the pH of pool water with a good quality water test kit.
    • Use the Dosage chart shown below to determine the correct amount of pH decreaser to add
      • 1 lb. = about 1.5 cups

pH Decreaser Dosage Chart:

Pool Volume pH 7.6 - 7.9 pH 8.0 - 8.4 pH above 8.4
2,500 Gal. 2 oz. 4 oz. 6 oz.
5,000 Gal. 4 oz. 8 oz. 12 oz.
10,000 Gal. 8 oz. 16 oz. 24 oz.
20,000 Gal. 16 oz. 32 oz. 48 oz.

How to add this product to your pool or spa:

  • Always have your pool pump running when adding this chemical.
  • With your pool pump running broadcast the pH reducer of the deepest part of the pool.
  • For shallow pools, dissolve in a pail of water before adding to pool.
  • Retest the pool and spa waters pH level and add additional pH decreaser if needed.

This product can also be used to lower the Alkalinity in your pool.

  • Ideal range for your total alkalinity is between 80-120 parts per million (ppm). National Pool recommends that your test your total alkalinity at least once per month .

Dosage for lowering Alkalinity:

  • Make sure your pool pump is running.
  • For high alkalinity: add 2 lb of pH Minus for each 10,000 gallons of pool water which will lower alkalinity by 10 ppm.
  • Repeat daily until perfect alkalinity is reached. Contains: sodium bisulfate - dry acid

Active Ingredients: Sodium Bisulfate

Safety Data Sheet

Baleco Brand Page

Download the All-In-One Water Care Booklet

Water Balancer Type:
pH Decreaser