Aquarium Pond Sponge Foam Filter System 15-50 Ppi Water Filtration. Biochemical Filter Sponge Enhance Your Aquarium's Ecosystem with Our Biochemical Filter Sponge. Designed to Improve the Health of Aquatic Environments, Its Advanced Multi-porous Structure Efficiently Breaks Down Waste and Excess Food, Promoting a Cleaner, Healthier Tank. By Supporting the Growth of Beneficial Bacteria, It Helps Maintain a Vibrant and Balanced Habitat. Suitable for Both Freshwater and Marine Aquariums, This Durable Filter Sponge is Crafted for Longevity and Optimal Performance. Its Customizable Design Ensures a Perfect Fit for Any Filtration System, While Its Lightweight and Soft Nature Simplifies Maintenance. The Reusable and Easy-to-clean Features Keep Your Aquarium in Peak Condition Effortlessly. Features: - Multi-porous Design: Prevents Blockages. - Thick and Durable: Ensures Long-lasting Use. - Versatile Use: Ideal for Both Freshwater and Marine Environments. - Customizable Size: Trim to Fit Various Systems. - Lightweight and Soft: Easy Handling and Maintenance. - High Water Permeability: Supports Efficient Flow. - Supports Bacterial Growth: Encourages Beneficial Bacteria. - Reusable: Easy to Clean and Reuse. - Color: Black - Replacement Recommended: Every Three Months *Note: Sponge May Arrive Compressed; Allow 1-2 Days for Full Expansion. Manual Trimming Can Lead to Slight Size Variations (0-2cm). Includes One Filter Sponge.*.