Maintain a healthy and thriving aquatic environment with the Aqueon EcoRenew Replacement Filter Cartridges. These dual-sided cartridges feature fibers made from plant-based materials infused with carbon to help reduce impurities and odors. The NoDrip design helps eliminate extra mess when changing your filter, too. Designed to break down naturally over time, Aqueon EcoRenew Cartridges offer an eco-friendly alternative to traditional plastic filter cartridges—replace every 4 weeks for optimal performance. Available in extra small, small, medium, and large sizes, these cartridges are perfect for both freshwater and saltwater aquariums.