Hi,
First, thanks for all the good info!
As suggested here, I lowered my AT until I had a steady PH of 7.5 (It was 8.0 after filling my new/first spa last week). Problem is that my TA is now only 40. And if I try to augment it, my PH goes back up.
With those numbers, I will need a CH over 400 to bring the CSI close to zero!. CH is currently around 100.
What is the solution???
By the way, I'm using Bromine tablet and I didn't shock the water yet.