Hi all! I'm new here so I hope this is being posted to the right place. So Me and my roommates recently built a stock tank pool using a 1200 Gph Krystal Clear Sand Filter Pump, 110-120V with GFCI. The filter is drawing water in, but not pumping it back into the pool. My roommate thought the issue was that he used the wrong kind of sand so we had swapped to the proper sand, but are still have the same issue. I feel like its maybe a clog somewhere? Any and all help would be greatly appreciated!