If you are going to maintain a high CYA level pool, how do you test for Ph? It should never come down to the range that would give good numbers. The pool came down from 32 on Monday to 25 today. Pool is still very green, how high can Cl levels go before they are damaging to pool liner?

I don't think the other numbers matter right now but here they are:

FC - 25
CC - 0
Ph last tested with lower Cl - 7.0
ph now - about same
CH - sample turned white after starting to titrate, don't think I need CH for vinyl pool however it does throw off the balance number not having any.
TA - 40
CYA - last tested around 200

Plan tomorrow was to put more Borax in, possibly two more boxes.
add three gallons of 12.5% to bring back up to 32 ppm Cl.