Thought about putting a T above the 18 inch mark. Letting a piece of hose run up the wall a foot or two. This way when the siphon starts it will pull water from hose and get air??? Is that similar to the funnel you were talking about? Ro
water is in laundry room and runs through the wall to sump so I have very little room to work with. If I use the T the water should not have enough pressure to push up and out of the open hose. It should run down hill to sump then suck air through the same open hose.