The best way to aerate a koi pond is to constantly draw water from the bottom of the pond and return it to the top. This takes the poorly aerated water at the bottom and sends it up to come in contact with the oxygen at the surface. Constant circulation, 24 hours a day, is needed to maintain proper aeration in a koi pond.

Using a subsurface aeration system is the most powerful method of aerating a large koi pond. Subsurface aeration works so quickly because of how it starts the aeration from the bottom of the water. It uses something called a diffuser to accomplish this. The diffuser is the device that creates tiny bubbles. These will come to the pond’s surface.