Bottom up Aeration systems are 5-10 times more effective than surface aeration. These systems work by injecting oxygen into the water through the diffusers that lie at the bottom.
Principle of operation
Small bubbles are diffused into the deepest section of the tank, and as they rise up the water column, oxygen is transferred across the surface of the bubbles and into the water. This achieves total tank aeration from the bottom, up to the top regardless of the depth of the water.