Oase BioMaster 60ppi Pre Filter Foam

The Pre-filter Foam Set 60 ppi for the BioMaster 250, 350, 600, or 850 and BioMaster Thermo 250, 350, 600, or 850 includes 6 ultra fine replacement filter foams 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 Pre filter foam for Oase BioMaster Various pore sizes available Various set sizes available Doesn't rot under water