What happened to the interested company? Do you need some help to ge this idea done? If it works on big pumps (and it is used alot for large water treatment and water energy plants), it should work for a smaller scale just fine. A strong plastic impeller, PVC tubing, a graphite shaft, and some PVC tubing with an end plate the pump can mount on should do it. The only complicated part is getting the right propeller, the right shaft, the right pipe size, and the right rpms and proper hp rating for each size. we can even backyard wonder it and fill a 55 gallon drunm and time it to know how many gph each prop/pump/ pipe size combo does. Do you need some help? Or do I need to just go ahead and do it?
I have been patiently waiting cuz I dont want to steal your idea, I've had it done to me and don't wanna do it to you, but if you aint gonna move it forward or let others help, well, we need that pump!!!