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MarinePure Biomedia is the best way to add biological filtration in a small and tight space. MarinePure is designed to be a substrate for bio-filtration, specifically to target ammonia and nitrite removal (nitrification) and to minimize nitrates (denitrification).
The combination of vast surface area and open/interconnected pores allows a thin bio-film to develop. This thin film allows bacteria to flourish because necessary nutrients are immediately available. With the open pores, old dead bio-film is easily flushed from the media and will not plug the media. Water flows through the media, not around as with other denser medias, thus utilizing the most surface area for beneficial bacterial growth.
Before use we suggest rinsing the biomedia with aquarium water or RO/DI to help remove surface particulate created during shipping.