To answer another question you asked the other day, yes, you can put your filter on recirculate while you chlorine is high. One thing I am wondering about in your pool is your pump size. A 1.5hp pump with a 200 lb. sand filter for a 24ft AG is way too big and a mismatch between pump and filter size. In the case of pool pumps, bigger is not better. A too powerful pump can push debris and algae right through the filter media and right back into the pool without filtering it out. I'm wondering if that is happening in your pool. Go ahead and put it on recirculate and see if you can kill the algae before trying to filter it out. Continue to keep the chlorine high. See if that helps any.