The spa is a 5' x 10' with a Diamondbrite interior. Therefore the calcium at 200 ppm minimum. The pH of 7.4 was chosen to match the pH of eyeballs. I was trying to stick the pH in place with the high TA.
If we still aim for a pH of 7.4 and lower the TA to 80 what do you think will happen?
What is your defination of boric acid? I have used sou
dium tetraborate penta hydrate in the past. First from John Girvan and lately from Haviland. Are there other good replacements? Do you think that the borates will help us avoid pH bounce with a low pH?
It is nice to have time sweat these small details.
I don't know how to account for borates with the LSI.