About This

• Clearer Water Support - Keep your aquarium fresh and help reduce visible debris! This replacement bio-sponge for the Cascade 300 (CIF1) captures dirt and debris, restoring strong water flow and vibrant tank clarity.
• Balanced Aquatic Environment - Promotes balanced water by supporting mechanical and biological filtration - perfect for creating a clean, well-maintained environment for your freshwater or saltwater fish.
• Easy Clean, Easy Reuse - Rinse in aquarium water, reuse, and keep filtering! Designed for long-lasting use, it helps maintain natural filtration balance and dependable filtration with minimal effort.
• Perfect Fit Every Time - Comes with one black sponge measuring 2” (L) x 1.75” (D) x 1.75” (H). Custom-shaped to fit the Cascade 300 Fully Submersible Internal Filter (CIF1) for smooth, steady performance.
• Inspired by Penn-Plax - With decades of experience creating trusted pet products, Penn-Plax designs habitats that blend reliability and ease - helping pet owners care for their small companions with confidence and creativity.