A week ago my CYA was 100. (where did it go and why?) I only have about 2-3 hrs of full sun.

Should I continue to chlorinate with the cal hypo (I have over 75lbs on hand) or should I return to the BBB method?

The reappearing stain is still dramatically less than when we began. (much more presentable) so were still very grateful to all the guidance.

Thanks