By supplying energy in the form of heat or hydraulics to the drive piston, the two sluices are brought into function. This causes the working bodies to move from atmospheric pressure to the pressure ratio in the water-filled tower with each stroke and drive the lift chain through their buoyancy. Once at the top, the working bodies are transferred to the output chain. Their own weight now drives the output chain, transporting them back down to the sluice. The chain connection of the up and down drive enables the use of both energies. The communicating tube ensures a balance of forces in the system.