Ceramic rings don t filter your aquarium.
Ceramic rings biological filter media.
The micropores have a mild tendency to clog but can easily be clean and replaced.
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They simply provide a home for the bacteria that do all the hard work.
Bioballs and ceramic rings are two basic biofilter choices.
Zeovit is part of a specialized system to maintain ultra low nutrients.
While there are other types of ceramic based filter media ranging from spheres to sticks they all behave similarly to ceramic rings.
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Bio pellets are a plastic media that house and feed bacteria.
Many hobbyists use highly porous ceramic plates or bricks housed in the sump.
Keep in mind that some of these materials can also be used as mechanical media.
Fluval s biomax filter media consists of porous ceramic rings that are designed to optimize surface area and support growing bacteria populations.