What I said was that I've seen pools with algae growing with zero CC, so that you can't use CC only as an indicator of when your pool needs shocking. However, if you have an algae bloom and CC greater than zero, and you've shocked to kill the algae, my point is that falling CC together with visible signs of algae death can be used as an indicator to let your Cl fall off to normal. My point is that while CC is one of the best indicators, I wouldn't usre it as the sole indicator.

Janet

Janet