I think the air
It is cheaper better for environment, saver and has lots of potential for improvement
Pressure to torque turbine, air turbine
https://youtu.be/GCgRD7cjLEII think it would work better is shaped like a Schauberger funnel, hyperbolic funnel, Black Hole Funnel, Gravitational well or whatever someone likes to call it. Nature does not work linear.
how clean the water exits
https://youtu.be/YpNJUqnVGvUhttps://youtu.be/L8E19IuFwfk