Lower alkalinity when you have a splashing spillway for the spa.

[joconnor54]

I have alkalinity in the 150 range, which I am trying to lower using information from this forum.
My ph has always seemed to rise to the 7.8 range, I add acid and in a week or 2 it is back up there.
I have a built in spa that is higher than the pool with a spillway that 'splashes' into the pool when the filter is running, (about 8 hours a day).

Am I always going to have the high ph problem because this spillway acts as an aerator?

It is a remodeled pool about 3 years old, built in with a pebbletec finish. 21,000 gal. Cartridge Flilter CCP-420

 

[JasonLion]

Welcome to TFP!

The spillway will certainly provide some aeration. If TA is at all high you sill see some PH drift due to the combination of high TA and aeration. Lowering TA will either eliminate the PH drift or greatly reduce it.