The Pre-filter Foam Set 30 ppi for theBioMaster 250, 350, 600, or 850 and BioMaster Thermo 250, 350, 600, or 850includes 6 coarse 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
