pH Minus
pH Minus (also known as pH Reducer, Dry Acid and Sodium Bisulphate) is used for decreasing the pH of your swimming pool water.
Add at a rate of 50g per 4,545 litres (1,000 gallons) of water.
Please read instructions on the products before use.
For more information on chemicals and water treatment there are documents and downloads available in our Resources section.
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pH Minus / Reducer / Decreaser (Dry Acid) in granule form to lower the pH level of water. Ideal pH is 7.4 – 7.6.






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