Oase BioMaster Carbon Pre Filter Foam

The carbon pre-filter foam set for the Bio master 250, 350, or 600 includes 6 carbon replacement filter foams Safely regulates the pH value and water Hardiness Activated carbon absorbs unwanted substances in aquarium water Customize your choice of filter foams to meet the needs of your Aquarium Carbon filter foams make replacement much simpler than common granular forms   Oase Biomaster 250 needs 4 foams Oase Biomaster 350 needs 5 foams Oase Biomaster 600 needs 6 foams Oase Biomaster 850 needs 6 foams