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