I woke up this morning to my canister filter not pumping out water. I thought there was a clog so I cleaned it out fully and put it back together. I couldn't get it to prime so so I decided to clean it out again and this time fill it with water to cut out a step. After I put it back AGAIN it still isn't working. I have primed it about 300 times and sometimes water will trickle out and then stop. I don't feel a suction on the intake tube at all and I am very confused. Please help!