Need help with chemicals before closing


Active member
Jun 7, 2010
I am preparing pool for closing and I shocked the pool but my TA and PH are high and can't get to low. Need help with it.

FC 18 (It was 23 after shock and reduced by 5ppm in 24hrs, I used BBB method.)
CC 0
TA 115
PH 8.2
CH 110

I added Dry Acid 3lbs by mixing it in water to the pool. Ph came down to 7.8 after 1hour, but went back to 8.2 by end of the day.

What should I do?

1. Should I be reducing the Ph to 7.2 - 7.4 and TA to 80 -90 before closing?
2. Or does it matter if Ph his high before closing?
3. Will it affect my new Vinyl?

Please advise.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
Lower the pH. You do not want it that high ever and certainly not over the winter. I prefer muriatic acid but whichever you use, continue to add it until your pH stays around 7.2 - 7.4 and then close.

Other Threads of Interest