pH Minus – Blue Horizons


Product Name Price Qty

Blue Horizons pH Minus is a granular acid for lowering the pH of your pool water if it rises above 7.6. 

The effectiveness of all chlorine based sanitisers decreases as the pH level of the water increases. pH minus (also known as pH reducer) can be added directly to the pool water to reduce the pH to a desirable level.

For the chlorine to remain effective, the pH level should be kept below 7.6. However if the pH level drops too low then the water can start to degrade pumps and liners, so aim to keep the pH level between 7.2 and 7.6.

pH minus is suitable for use in swimming pools, spas and hot tubs.



1. Pre-dissolve the product in a clean plastic container at a maximum rate of 100g of product per 2.2 gallons (10lts) of clean warm water. Stir well to ensure product is fully dissolved. Carefully add the resulting solution to the pool whilst the pump(s) are turned “on”, preferably near to the water inlets to aid distribution.

2. After a minimum of 8 hours, recheck the pH level and if necessary repeat the treatment until the ideal pH is established.


Dose rates

Litres Gallons Dose rate
4,545 1,000 50g
11,364 2,500 125g
22,500 5,000 250g
45,450 10,000 500g

Please note a number of treatments may be required

Additional information


Blue Horizons




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