Had the grand kids over for a swim. The youngest is just getting over from a ear infection and only 3 years old. He was wearing swimmers, he was hanging out by our bubblier. I shocked the pool after they left. This morning I found Feces on the bottom of the pool. It was clump together but when I scooped out most of it out but its breaks up and now very small fine partials. Had the water checked and only the alkalinity was off. Will chemicals take care of it or would it need to be drained?