The open rotor of the TRN series suctions a large volume of water for the motor power through the pump basket. This water is then mixed with air and distributed horizontally in all directions through the channels of the guide ring.
The top of the rotor is hollow and allows the air that has been suctioned in to fill the area aroundthe shaft seal so that it can mix with the water at the rotor. One consequence of this is that alayer of air is formed separating the shaft seal from the medium and thereby substantially increasing the life of the shaft seal.
Another effect is that the water that is suctioned in is oxygenated with tiny air bubbles, effectively aerating the waste water.