Aqueon PRO Replacement Filter Cartridges are designed to keep your aquarium water clear while making maintenance quick and hassle-free. Featuring a NoDrip design, these cartridges help prevent spills and mess during filter changes. Each cartridge contains even distribution of activated carbon, which helps remove toxins, odors and discoloration for clearer, healthier water. The convenient “FRONT” orientation tab ensures proper placement every time, making installation foolproof. These cartridges are compatible with the Aqueon PRO QuietFlow Power Filter Size 20, 30, 50, 75 and Aqueon SmartClean Power Filter Size 20–30G, 30-50G, 50-90G. For best results, replace cartridges every 4 to 6 weeks. Each pack includes three replacement cartridges perfect for both freshwater and saltwater aquariums.