The Aqueon Replacement Aquarium Filter Cartridges Medium 3-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 3-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.