Aquarium Filter Media
Aquarium filter media is the material in your aquarium filter that your water passes through. Each kind of aquarium filter media performs an important function. Biological media removes ammonia, nitrites and nitrates from organic waste. Mechanical media removes solid debris and particulates. Chemical media removes pollutants and organic compounds. Using the right filter media is vital to the health and cleanliness of your aquarium, and it comes in many different materials and forms to fit your needs.
(If you came here looking for diatomaceous earth, you'll find it with our diatom filters.)