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Replacement Foam for OASE BioMaster and BioMaster Thermo Filters.
The OASE BioMaster Foam Blue 20ppi is designed for the OASE BioMaster and BioMaster Thermo Filters. This product is 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 may vary depending upon aquarium size and the number of fish and plants.