pH Correction Swimming Pool Chemicals

pH Correction Swimming Pool Chemicals - All chlorine based sanitisers become less effective at killing bacteria and viruses as the pH rises (becomes more alkaline).

To keep the chlorine working it is recommended that the pH is kept below 7.6.
However if pool water becomes less alkaline it also gets more corrosive and less comfortable to swim in
Also, if pH drops below 7.2 it will start to attack some liners
Therefore, the pH is recommended to be above 7.2. So the normal range that a pool water should be kept at is 7.2 to 7.6 (ideally 7.4 to 7.6).
On most pools the pH will tend to rise so pH minus (sodium bisulphate) is added. The exception to this is if trichloro isocyanuric acid is being used in which case the pH will go down and an alkalinity builder will be required.
The pH is tested using pH test kit which uses phenol red tablets in a comparitor tube
It is difficult to predict how much acid will be required to reduce the pH to a precise level as it depends on what else the water contains.
For instance a soft water will require less acid to adjust the pH than a hard water
We suggest adding 500 grams for every 45 cubic metres (10,000 gallons) and then re testing after 12 hours and redosing if necessary. You will soon become familiar with the amount your particular water requires.
To dose dissolve in warm water in a clean plastic container and distribute evenly around the pool with the filter operating

Our main aim is to help you have many years of happy usage from your swimming pool and this care giude should only be used as a general guide for more information on caring for your swimming pool please contact us now!