If you lower the Total Alkalinity (TA) significantly, then you may have to raise the Calcium Hardness (CH) UP somewhat, not down. Also, the use of Borates can also help reduce the rate of pH rise significantly.
Re: PH too high
If you lower the Total Alkalinity (TA) significantly, then you may have to raise the Calcium Hardness (CH) UP somewhat, not down. Also, the use of Borates can also help reduce the rate of pH rise significantly.
Re: PH too high
This very common w/SWGs and new concrete pools. It's counter-intuitive but the solution is correct.
Carl
Re: PH too high
Not counterintuitive at all once you really understand what is happening in your pool!
Lowering the TA means lowering the carbonation of your pool (all pool are over-carbonated on purpose). This means there is less carbon dioxide in the water that can outgas. Outgassing of CO2 is one of the main factor that makes the pH rise. (There are others but they are not the primary reason pH rises, with perhaps the main exception being curing plaster which introduces alkaline material into the water.)
Retired pool store and commercial pool maintenance guy.
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