Black Reusable Bio-sponge Filter For Aquarium & Pond Water Filtration. Transform Your Aquarium into a Flourishing Aquatic Haven with Our High-performance Biochemical Filter Sponge. This Innovative Filter Enhances Water Quality by Effectively Decomposing Waste and Residual Particles, Ensuring a Pristine Environment for Both Fish and Plants. Its Advanced Multi-porous Structure Minimizes Clogging and Maximizes the Surface Area for Beneficial Bacteria, Making It Ideal for Both Freshwater and Marine Ecosystems. Constructed from Robust Materials, This Filter Adapts to Various Tank Sizes, Optimizing Water Flow and Providing Superior Biological Filtration. It's Designed for Straightforward Maintenance, Effortlessly Capturing Debris While Maintaining Water Clarity and Vibrancy. Features - Efficiently Decomposes Waste and Residues - Clog-resistant Multi-porous Design - Durable and Adaptable for Various Tank Sizes - Suitable for Freshwater and Marine Environments - Lightweight with Excellent Water Permeability - Promotes Beneficial Bacteria Growth - Easy to Maintain and Reusable - Available in Multiple Sizes and Pore Densities - Recommended Replacement Every Three Months Package Includes - 1x Biochemical Filter Sponge Color - Black Available Sizes - 50x12x2 Cm - 50x25x2 Cm - 50x25x3 Cm - 50x25x4 Cm - 50x50x2 Cm - 50x50x3 Cm - 50x50x4 Cm - 50x50x5 Cm.