Ok I did a Jacks Magic treatment in late April/May. It says you will get false FC readings for about a month. Well I've reached that point. I've been seeing high CC levels and decided to SLAM the pool today.
CC - 8
pH - 7.8
TA - 120
Cya - 50
I raised my FC up to slam level and just checked it after 2 hours. FC is 22, but CC is 21 now. Is this normal? Pool is perfectly clear.