We had a torrential downpour the other day and woke up to a dirty pool. And I mean dirty. Dirt and debris took over the pool. We've balanced it and vacuumed several times. There is a touch of algae, but when I brush the pool, it's brown gunky stuff that I see being brushed around. A friend suggested we "floc" the pool. I've never heard of that before. Is this something you might recommend, and would it help with the leftover debris that is in the pool?