I actually agree Vortex, I say actually because this is my drawing

But yeah I have began to understand the problem, and air can fix it perfectly!
It will then look much like Heron's Pump, which I think already gives us free energy.
With a two-cylinder setup where water will fall in down in one, in such a way as to build up air-pressure in the second, which then pushes on the surface of the water, this could have worked. Again it will then be something very close in operation of the Heron Pump.

But, still with the old design, I've heard that wood is actually possible to use as the piston material, and then it could be fitted with rubber around the its outer surface. I guess the tube inside a flattened bicycle wheel could worked as the rubber. But then if that could work, I think that the biggest problem still is the cylinders or containers. However, if we used air pressure and water without any pistons, meaning less work and less expense, then we could have afforded combining several cylinders together forming a larger surface. Seems it could be possible..
Bye for now,
Julian