Thanks to the PO, my setup is crappy--but it works. Jabsco
manual pump, with a tall holding tank in a hanging locker across the boat from the head. So the hose (smooth), runs forward under the V-berth, crosses to the other side of the boat, and then up at least 4 feet to the top of the holding tank. This is about 9-foot run. The discharge hose makes the same run in reverse, beginning with a 4-foot climb from the bottom of the tank to the top, then down, across the boat, through the pump and out the thru-hull.