So it dropped from an expected 10ppm to 3ppm in 30 minutes? At least the CC are pretty low. Did you dose back up to 10ppm after the 3ppm reading?
What did you target with your CYA addition?
Yes, I dosed it back up with the addition of another 2 bottles (that's all I have left at the moment), after 30 minutes, it's reading 3.5 FC and .5 CC
Forgive me, but what target are you referring to with the CYA comment?