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For use with BRAVO back-hanging filters. Also fits Proquatics(reg) 120, 200, and 300 model power filters.Triple action filter cartridge provides mechanical, chemical, and biological filtration.Note: BRAVO back-hanging filters use two cartridges. Manufacturer recommends replacing only one of them at a time. This will help to quickly re-establish aerobic bacteria growth on the new cartridge, an essential part of the life cycle of a healthy aquarium. Cartridge measures 5 3/4"" L x 3 1/4"" W.