I took the filter out the past weekend to clean(Unicel fg-1004). This the second time I have done this process. Anyways, the pool vacuum ran for 2 days until today. I checked the waste basket near the pump and water is not flowing. I noticed my vacuum "pool cleaner" is stuck (wheel is not spinning due to sand).
I let some air out of the pressure valve but without any luck. Whenever I opened the backwash, water would circulate normally. Plenty of water run through the pump (I can see it from the glass with the basket).