Tetra Whisper Bio-Bag Filter Cartridges For Aquariums, Large, 12-Count - Unassembled

STAYCLEAN TECHNOLOGY: Active cleaning reduces buildup on glass and the water clarifier binds small dirt particles which are easier to filter. MAINTAINS HEALTHY PH LEVELS: Keeping stable water helps prevent pH crashes in your aquarium, providing you with easier maintenance. TIME RELEASE TECHNOLOGY: Time release technology precisely adds healthy buffers and water clarifiers that help maintain pH and reduce unsightly debris. ULTRA-ACTIVATED CARBON: Ultra-Activated carbon will remove odors and yellow discoloration to keep your aquarium looking better than ever. COMPATIBLE WITH BIO-BAG FILTERS: Our StayClean technology is still compatible with any filter that currently takes Bio-Bag filters today. This pack contains 12 large, unassembled cartridge. INTEGRATED DESIGN: Tablet holders molded into frame cover with time-release design.