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Ceramic rings biological filter media.
Many hobbyists use highly porous ceramic plates or bricks housed in the sump.
Ceramic rings don t filter your aquarium.
The micropores have a mild tendency to clog but can easily be clean and replaced.
Bioballs and ceramic rings are two basic biofilter choices.
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Keep in mind that some of these materials can also be used as mechanical media.
They simply provide a home for the bacteria that do all the hard work.
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.
While fluval recommends these filters be replaced every six months they tend to last considerably longer.
Zeovit is part of a specialized system to maintain ultra low nutrients.