Need advice on choosing better float system for water well cistern

I have a very strange setup that I will try to describe as best as I can as well as provide some pictures.
It starts with a belt driven 2-pulley wheel air compressor pump connected to metal pipe that converts to PVC. Part of the pipe goes into the ground and the other goes up and elbows over the top of the cistern's lid and down through the lid. It somehow forces water up the pipe and pours it down in to the cistern.
The electrical for the pump is routed through a D-box switch that is...

Need advice on choosing better float system for water well cistern