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Ceramic rings biological filter media.
Many hobbyists use highly porous ceramic plates or bricks housed in the sump.
Types include ceramic rings sponges pads bio balls and bio stars sand and gravel.
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.
Ceramic rings don t filter your aquarium.
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Bioballs and ceramic rings are two basic biofilter choices.
They simply provide a home for the bacteria that do all the hard work.
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.
While fluval recommends these filters be replaced every six months they tend to last considerably longer.