Tetra Bio-Bag Filter Cartridge with Stay Clean technology keeps aquarium water clean and clear. This filter's dual-sided floss sleeve removes dirt and debris and contains Ultra-Activated carbon to remove odor and discoloration. Its integrated design also includes a Stay Clean tablet that dissolves steadily over time, leaving you with healthier water and cleaner aquarium glass. Stay Clean technology helps reduce buildup on aquarium glass, bind small dirt particles to make them easier to filter and stabilize pH levels to prevent crashes – meaning easier aquarium maintenance for you.Tetra Bio-Bag Filter Cartridges are compatible with Tetra Bio-Bag aquarium filters – each package is color-coded to make it simple to remember which size to purchase. These replacement filters are assembled and ready to use for your convenience. This medium-size filter cartridge fits Tetra Whisper 10i Internal Filter, Whisper PF10 Power Filter and Whisper IQ10 Power Filter. For best results, change your filter cartridge monthly or sooner if needed.Since 1951, Tetra has developed the world's most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor.