- The Carbon Pre-filter Foam Set for the BioMaster 250, 350, or 600 includes 4 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
- Timing to replace the pre-filter foam set varies upon aquarium size and the number of fish and plants