Tried what? To make a penductor defy gravity??? :rollface:
Seriously, I've seen one work in a tank and they work great. Only thing you need is pressure. The more psi the better they work. I built my own using some pieces of PVC hose barb fittings. Hard to explain but one of these times I'll take a picture.
Anyway, penductors (aka eductors) do a great job if you have the room and pressure.