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