effect of high free chlorine on Ph

mikemedic

Well-known member
Apr 21, 2008
74
I have been keeping my FC at 25 to kill an algae bloom. My PH was ~7.4/7.2
Its reading 7.0 now
My alk is about 60-70
Should I let my FC drop before I adjust?
Does high FC make ph rise or fall
Thanks

Mike
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,629
SW Indiana
High FC doesn't affect the pH, but it does mess up the test. Wait for lower FC before you trust your pH reading.