Aquarium Pond Filter Pad Water Filter System For Fish Tanks. Elevate Your Aquarium's Ecosystem with This Versatile Biochemical Filter, Expertly Designed for Superior Biological Filtration. It Promotes the Growth of Essential Nitrifying Bacteria to Efficiently Break Down Waste and Excess Feed, Maintaining a Pristine and Healthy Aquatic Environment. Constructed from Robust, Durable Materials, This Filter is Suitable for Both Freshwater and Marine Tanks. Its Customizable Design Allows for Easy Resizing, and the Strong Build Ensures It Can Be Reused After Cleaning. Despite Being Lightweight, It Provides Powerful Filtration, Making It an Essential Tool for Any Aquarium Enthusiast. Features: - Enhances Biological Filtration by Promoting Nitrifying Bacteria Growth - Efficiently Decomposes Waste and Excess Feed - Built with Thick, Durable Materials - Ideal for Both Freshwater and Marine Setups - Adjustable Design for User Convenience - Excellent Water Permeability - Reusable Post-cleaning - Color: Black - Recommended Replacement Every Three Months - Includes: 1x Filter Biochemical Cotton Note: Vacuum-packed for Shipping. Allow 1-2 Days to Restore Original Shape if Compressed During Transit..