My PH also goes up with the bleach. PH usually runs around 7.6-7.7. When it gets any higher I add some acid. Usually once a month. With all of the rain I have actually had to add some Borax this year I add 1.42 gallons of bleach every 3 days give or take. Our rain water is way down on the scale! PH Test comes up yellow Once the rain is over I am going to try adding some Trichlor pucks to the chlorinater and place it at the lowest setting. I have lost a bit of CYA from draining due to the rain and I'll see if the pucks offset the bleach in regards to the PH difference.