It seemed my chlorine levels were drifting down quicker than expected. I did an overnight test and the FC went from 5.5 to 4, the CC is <0.5.
My CYA is 70. Other numbers below and all look spot on.
I've had to run my SWG at 90%, 12 hours/day and even then I am supplementing in some liquid bleach.
I know it says to SLAM if FC drops over 1 overnight, which it did just barely... (1.5)
Or could it just be since it's been sunny lately (my pool gets sun exposure the whole day) that I need to up the hours I am using my SWG? I just thought that 12 hours at 90% was pretty high and to still not get chlorine maintained at that level...
FC 4 PH 7.5 CC <0.5 TA 70 CYA 70 CH 300 Salt level 3500 (Manufacturer recommends at 3000-3500)