Tetra StayClean Bio-Bag Cartridges provide easier maintenance for healthier fish by maintaining healthy pH levels in your tank. Stable water helps prevent pH crashes, and the active cleaning reduces buildup on glass. The dual sided floss removes dirt and debris from your tank leaving you with a clean environment. Compatible with Bio-Bag filters, these cartridges provide 4 stages of filtration to keep your water clean and clear. Ultra-Activated carbon will remove odors and yellow discoloration to keep your aquarium looking better than ever. Create a focal point for any room with a clean, clear aquarium.