Opened the pool on Friday evening (typing this 4 days later, now Tuesday evening). Had a nice new cover on it all winter, opened before the water hit 60*, and people here say I did good in my closing, so I opened to perfect looking water.
Test results AT opening:
FC = 12.5
CC = <.5
pH = 7.3
TA & CH were fine
CYA = 70-75 or so, tested with brightest indoor light I had.
Even though it had FC in it and looked clear, I went ahead and put it up to shock level using bleach (33 based on my CYA level, though I think I missed a little high and went to 35).
Pool has been UNCOVERED ever since, filter running on high "most" of the time since, and it was pretty cool and cloudy Saturday/Sunday, had some sun Monday and lots of Sun today. This evening, my FC is still around 22.5 (with outside light, CYA looked more like 65). Should it really be this slow to come back down? Is it just a product of my high CYA and the limited sun we've had these last 4 days?
This is NOT the first time I've felt this way - It seemed I had issues even in the middle of last summer with the pool being VERY slow to come down from shock level, so I want to try and understand exactly what is/isn't going on here, and what to expect going forward.