Carbon Pre-filter Foam Set of 6 for the BioMaster

• The Carbon Pre-filter Foam Set for the BioMaster 250, 350, 600, or 850 and BioMaster Thermo 250, 350, 600, or 850 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
• Timing to replace the pre-filter foam set varies upon aquarium size and the number of fish and plants 

six carbon replacement filter foams