Oase Biomaster Foam Blue 20ppi
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 pre-filter foam set varies upon aquarium size and the number of fish and plants