Biological filtration media or also know as Bio media is a type of Aquarium filter media designed to provide a place for the beneficial bacteria to settle on and form stable colonies. Bio media includes products like Bakki Rods, Bakki Balls, Biopure (AKA Marinepure), Ceramic rings, bioballs and Seachem Matrix just to name a few! At Aquaholics we understand the importance of quality media and how it interacts with your filter, this is why we only sell Bio Media that we use ourselves so you know that the Biological media you purchase from us work!