Filter Foam for the BioMaster 20 ppi blue

• The 20 ppi Replacement Filter Foam for the BioMaster 250, 350, 600, or 850 and BioMaster Thermo 250, 350, 600, or 850 includes an ultra-coarse replacement filter foam
• Customize your choice of filter foams to meet the needs of your aquarium
• Timing to replace the filter foam varies upon aquarium size and the number of fish and plants

one ultra-coarse replacement filter foam