I am willing to try cleaning the sand but don't know what to do. I put in a good amount of laundry detergent and left it for 2 hours and then backwashed it out but the filtration still is nothing. Even though the pool is now quite cloudy, the filter back pressure has not gone up in 6 hours of running. You spoke of channeling. How do I undo that? Maybe I should replace the sand. This is stopping a lot of swimming.