hydro powering our tanks

[phish guy]

i was just thinking the other day, why dont we incorperate hydro power generators into tanks, ecspecially larger systems. i mean with all the water flow we encorperate through filters, isnt there a way to harness the power? just simple wheel on the inlet would spin like a turbine in a dam and generate power.

now im no electrican but wouldnt it work? i mean i dont think we could power our houses or anything but couldnt it at least power our tanks, or at least cut the cost of powering our tanks?

just some thoughts. anyone think it would work?