I did my tests yesterday morning. For the first time, I got a CC reading of 1. My FC has been pretty stable around 4.5 for the past few weeks.
Free CL - 4.5
Comb CL - 1
PH - 7.4
Total Alk - 80
CYA - 65
I was worried about the CC so I tested again last night.
This time, my FC was at 6 and my CC was 0-.5 (when I added the reagent the solution was very faint pink and cleared completely with one drop).
Is a jump in FC normal? Is it normal for CC to lower on its own?
The water is crystal clear and there was no rain or anything unusual yesterday.