- 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
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