I just cleaned my DE grids and backwashed. When I starting running my filter like normal looked like some residue fom the backwash was still in there and came back in my pool via returns. It cleared up, but the water is still slightly cloudy. Is this normal? I fills the skimmers with DE and plan to run the pump throughout the night with efforts that it should be crystal clear again. If this isn't normal, do I need to backwash again just more thoroughly?