When you close the filter be sure to wipe the gaskets and make sure everything is cleaned off them. I prefill mine in the sink after I clean it before I hook it back up. Iuse the funnel and fill until just before water comes out the of the top. I take it in to the tank, and hook back up. Plug in, and hopefully the inlet and outlet tubing retained their water and you don't ahve to reprime. It will spit some are for a little bit, and then while hooked up and running gently tilt from side to side and let it thump down on the floor to shake the air out. side to side and forward and backward. that is usualy what I do after I clean and hook mine back up.