pH: how high is too high?

[Ronald U.]

Greetings, fellow travelers and pool owners. So my CSI is still fine with pH 8.3. But how high is too high as regards pH's effect on the pool's infrastructure? Thank you.
Today's readings: FC 5.5
TA 100
CH 200
CYA 30
Temp 62
Salt (from 9/19) 2400
Borate (from 9/19) 40

 

[ajw22]

High pH can lead to scale with a high CSI. No pH is too high if other factors in your water chemistry like your low CH and low water temperature offset it.

What is your CSI?

 

[wogster]

The ideal pH is 7.4 although commercial pools are limited to 7.2 to 7.8, I wouldn't go much outside this range.

 

[Ronald U.]

CSI according to Poolmath is 0.19. Scale will not occur, but does pH 8.3 begin to have a degrading effect on pool plumbing, pump interiors, etc.? Perhaps I should add that no one is swimming in this pool until spring returns.

 

[ajw22]

CSI according to Poolmath is 0.19. Scale will not occur, but does pH 8.3 begin to have a degrading effect on pool plumbing, pump interiors, etc.?

No. pH below 7 becomes acidic and can be corrosive. High pH is not damaging in itself.

 

[Ronald U.]

Thank you.