pH Reducer

Sodium Bisulphate - supplied here as dry acid - is used to reduce the pH of pool water. Chlorine works most effectively as a bactericide when the pH of the water is in the range 7.2 to 7.6. Where the pH rises above 7.6 it needs to be reduced and this can be done by adding an acid such as this.

Dry Acid can be added by mixing 1.0kg of Sodium Bisulphate per 100 cubic metres of water (equivalent to 1lb. to 10,000 gallons) into a clean bucket of warm water, stirring to dissolve the granules. Then pour this liquid into the pool by the inlets, to help it to disperse thoroughly.

Allow sufficient time for thorough mixing - a few hours - then re-test and dose accordingly.

CHIP information under the direction of the Health & Safety Executive:

This chemical is an irritant,
Category R41 - this chemical can cause serious damage to the eyes.