I am in the middle of a SLAM and somehow I way overshot the FC this morning. My CYA is at 80 so I've been targeting 31. I thought I got an FC of 24.5 this morning so I added 233 oz of 10% bleach. But now my FC is at 44 after 2.5 hrs!
Is it possible to have gotten a falsely low FC this morning if I didn't use enough powder? I can't think of what else I could have done wrong. My pool size has checked out with all my chemical additions in the past.
Also, about all I can do is wait for the FC to come down. How bad is this aside from a waste of bleach?
Finally, I was going to have one of my boys remove the lights from their niches so we can scrub inside them. This would probably involve needing to be in the pool. Do I have to wait until the FC is back down to 31?