Debbie,

Am I overlooking something? It appears you are done with the process. Why do you still want to shock?

Which of these criteria do you not meet?

1. Your pool water is sparkling
2. Your CC's are .5ppm or less
3. You can hold your FC overnight without losing more than 1ppm.

Why wouldn't you let the FC come on down to 3-5ppm and hold it there?

Well you have a point, hooray then it's done!! I was just concerned it was all for naught if CYA was present most of the time. I've been reading the algae posts and how algae can be present at low levels (and ours was at zero one day) and then all of a sudden 'bloom', didn't want to go through That again. Thanks for the note, I'll find something else to worry about