The Aqueon Replacement Aquarium Filter Cartridges Large 12-pack is a must-have for maintaining clean and clear water in your aquarium. Designed specifically for Aqueon filters, these replacement cartridges effectively remove impurities and debris from the water, ensuring a healthy environment for your fish. With a medium size and a convenient 12-pack quantity, these cartridges are easy to replace and provide long-lasting filtration. Keep your aquarium water clean and your fish happy with the Aqueon Replacement Aquarium Filter Cartridges.

•  Fits Aqueon QuietFlow Filter: LED PRO Size 20 & up and E Internal 40 gallon
• Ready-to-use cartridge contains high quality activated carbon that keeps water clean, rinse before replacing
• Installs in seconds: align cartridge bottom key slot for an accurate fit inside the Filter
• For optimal performance, change approximately every 4 to 6 weeks
• Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria