Oase Hel-X 13 BioMedia 800 ml

• For aquarium water that is always clear and healthy
• Highly effective biological filtration 100% compatible with animals, plants, and microorganisms
• Removal of toxins, such as ammonium / ammonia, nitrite and nitrate

The Hel-X 13 BioMedia for the BioMaster 250, 350, or 600 includes a replacement BioMedia allotment. The allotment contains 0.3 gallons of Hel-X BioMedia. Hel-X BioMedia has a large surface area across this suspending media form which is ideal for biological filtration. It is best to only replace the BioMedia when you do a complete tank restart as to not disturb the beneficial biological load.