Some of the water in the water recirculation system can by pass the heat exchanger. To adjust the temperature in the pond, the amount of water flowing through the exchanger can be adjusted. UV light can also help destroy some parasites, bacteria and viruses if properly sized. Oxygenates the water air stones waterfalls ozonator Ozone contactors are used to mix ozone gas with a portion of water from the pond. Ozone is used as a disinfectant to kill bacteria and other harmful microorganisms that may be present in the water.
Ozone is injected into a venturi through which water is flowing.
The micro bubbles created by the venturi allow the ozone to go into solution and begin the disinfection process. The contactor vessel is designed to give the ozonated water several minutes of retention time before mixing with the untreated water in the biological filter tower. Biologically detoxifies the water by converting ammonia to nitrites, and nitrites to nitrates. Biological filters convert toxic ammonia, from fish waste, to non-toxic nitrate. A media is used that serves as a home for the two types of bacteria required to convert ammonia.