Hey thanks for your reply!

We have a 24,000 gal AG, vinyl pool. I am talking about the Trichlor pucks. I had intentionally kept the CYA down in prep for leaving town but was not sure what the pucks would do to the pH. So I think I add Borax directly into the skimmer to raise the pH - but how much Borax? How high of a pH is too high? If the pH is too low does that mean the acid is too high and thus eats the vinyl?

My neighbors will be checking but I hate to burden them with too much - I have split the job between two thinking they can back each other up. And they seem to have no problem sending their kids over to swim. Oh well the more the merrier!