Question about pH when closing pool

jstblush

LifeTime Supporter
Jun 3, 2015
280
Pasco, WA
Hi All,
I am closing my pool and just wanted to check on something. I got the chlorine up to SLAM level yesterday. Today I went to check FC and get ready to close it. When I checked the pH it was 8.2 or even a little higher. The pH was 7.6 before. So I was wondering if adding all that chlorine is what made the pH go up so much so fast. If that is the case, do I lower FC before closing or is pH reading wrong because FC is so high?
Thanks for your help.
Sherry