Not sure what to do. I just finished vacuuming this morning. There was a lot of sand and dirt on the bottom (patio isn't done yet). I went to backwash and rinse, but when I flipped the pump off, changed the valve setting, and turned the pump back on, it just hummed/buzzed and doesn't turn. I suspect sand has bound it up. It was turning fine when I finished vacuuming.
Any suggestions on how to flush it out? It's a 1.5 HP "Premium Blue by Waterway".