Made from plastic, with lots of spikes or ledges, bio balls are used mainly in biological filters.
The unique geometric design of a bio ball ensures there is a significant surface area to allow bacteria to cultivate.
It allows the exchange of gases (CO2, O2, etc) and increases dissolved oxygen. It is also one of the best media for trickle filters.
Another design, but I do not like it as I feel that the design restricts airflow. It does not allow as much exchange of gases as the traditional type.
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