Oase Hel-X 13 Biological Filter Media 800ml

Oase Hel-X 13 is a highly advanced biological filter media as used in the Oase BioMaster External Aquarium Filter range. Oase Hel-x. Hel-X 13 Biomedia has been redeveloped by Oase engineers to further increase its biological settlement surface area. This increase is 13% more in comparison to the preceding Oase Hel-X Biomedia. Works great in other external filters as well!