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Biological filtration is the keystone of any recirculating aquaculture system (RAS). Biological treatment process is considered the most economically feasible approach. Unfortunately, there is no ideal biofilter can be used for all different purposes. Understanding the nitrification capacity of different biological filters under actual production conditions will help the recirculating system designers in proper selection of the economically biological filters for the large scale commercial production use. In this review, we shed light on the performance, pros and cons of some of the most commonly used biofiltration systems.

The Nitrification Capacity of Different Types of Biological Filters An Overview