Bioballs and ceramic rings are two basic biofilter choices.
Ceramic rings biological filter media.
Types include ceramic rings sponges pads bio balls and bio stars sand and gravel.
Zeovit is part of a specialized system to maintain ultra low nutrients.
Keep in mind that some of these materials can also be used as mechanical media.
Biological filtration media are like condominiums for bacteria.
Fluval s biomax filter media consists of porous ceramic rings that are designed to optimize surface area and support growing bacteria populations.
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While there are other types of ceramic based filter media ranging from spheres to sticks they all behave similarly to ceramic rings.
The micropores have a mild tendency to clog but can easily be clean and replaced.
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Ceramic rings don t filter your aquarium.
They simply provide a home for the bacteria that do all the hard work.