We bought a used Intex easy set pool 18 x 42 with the Krystal Clear Wet Set pump. I think the model said it was model 50 or 53. It's raining now or I'd go out and get the exact model. Sorry! Anyway, we hooked the hoses to the skimmer basket and port which is the lower port and the other hose to the upper port. We hooked the upper hose from the pool to the side of the pump that holds the filter and the hose from the lower port on the pool to the side of the pump that holds the motor. There's water in the pump and it sounds like it's running but nothing is happening. It sounds like it runs for a few seconds and then shuts off. My husband tried to reverse the hoses thinking he had it backwards and the motor side of the port was flowing perfectly but backwards, thus pushing water back through the skimmer basket. We can't figure out what is wrong. It appears that there is an air bubble in the bottom hose underneath the pump and we've done everything to bleed the air out, but still nothing. Any ideas? it's like the motor is running backwards. We did happen to notice when hooked up correctly that the pump would work when we tipped it up on it's side to look for air in the bottom hose under the pump. Strange.