Oase Hel-X 13 BioMedia oase pre filter foam Diaphragm Rebuild Kit for AP-20

Diaphragm Rebuild Kit for AP-20 Air Pump

cobalt sulfate

Advanced gravity shut off feature

For optimum biofilter performance use 1 capful for each 80 L (20 US gallons) once a month or with each water change and whenever introducing new fish or whenever medicating an aquarium

Now offered in black for better concealment

Oase Hel-X 13 BioMedia oase pre filter foam Diaphragm Rebuild Kit for AP-20The Hel X 13 BioMedia for the BioMaster 250, 350, or 600 includes a replacement BioMedia allotment Includes a large surface area across this suspending media form which is ideal for biological filtration Allotments contains 0. 3 gallons of BioMedia Replace your Hel X filter media only when completing a complete tank restart as to not disturb the beneficial biological load