Ozz, we have a flowjet unit and never had problems. we bought it while in Byron NY at the NE rally several years ago because they put us on a site about 10 ft below John Kohl's site and he was the last one in the row with sewer. So I had to pump 65 ft horizontally and 10 feet vertically to a Y fitting on his sewer. We turned a water and elect site to a FHU with the pump and 75 ft of 3/4 inch hose. Never had a problem and because of this system we now have 2 FHU sites at our home (sticks and bricks). It isn't as fast as the 3inch gravity dump but it solves problem we had a need for..
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