Ok, first time winterizeing my Jayco Melbourne 29D. Drained all tanks, shut off hot water. The water filter under sink has no cut off valve. No way to bypass it. So I said screw it. Went to water valves and put them, on winterize. 2 and 4. Put hose on inlet and into antifreeze bottle. Turned on pump...no suction on antifreeze ???? Ran for a long time....no suction. Went on line, read about the filter on the inlet. It was installed with dome out. Ok, took it out completely. Still no suck. What is correct way for the filter dome to be. Facing in towards couch or out toward me to allow suction??