Split from this topic to prevent hijacking. Bama
Gosh, im glad i saw your post oasis1, because I have a similiar situation and have been wondering too if my tests results of zero CC after opening my pool on May 20th is too good to be true. I have the opposite problem with my CYA level. I just got mine down from 100 to a 80, which was a process of draining and refill about 16 inches, (well water too, ugh) I havnt brought to shock level because i keep doin the overnight test and all looks good. My FC is holding at 5 for 2 nights now and when I check the CC its always 0. Im doubting myself and thinking that i have to SHOCK, but i guess if there is 0 CC why would I?? I am going to bring my FC up to 11 based on pool calculator. Also, I did add about 24 oz of Metal Control.
FYI for anyone who may want to suggest something to me: FC 5 (bringing up to target 11 tonight, 12.5 bleach) PH 7.5 ALK 140 , Water Temp 70 and Clear
NOTE: Last year this web site was the only thing that got my pool from green to blue again!!