NCR-1 Svært porøst filtermedia laget av sintret glass som tilbyr gunstige mikroorganismer de beste forholdene og sørger for redusert forurensing som ammonium, nitrit og nitrat. Aqua Nova ceramic rings are packed in a sealed plastic bag to avoid unnecessary mess, and also comes  in a Aqua Nova fine black filter bag, this makes it easy to use in any filter. The net has a zipper so you can adjust the amounts of ceramic rings in the net. Ceramic rings should not be used while the Aquarium fish are being treated with any form of medication.