Hmm. My pool is in direct sun dawn til dusk. The weather has been much cooler the past days than when I shocked in early July. My CC then was only .5. I don't know. I never had any algae that I was aware of.
Thanks for your input. I was just wondering about the cal hypo. I didn't buy it. It was left here by the pool tech after he did some work. I'll stick with the bleach in any case.