Fish Tank Bio Filter Media - Available In Various Sizes. Transform Your Aquarium into a Thriving Aquatic Haven with These High-performance Bio Balls, Expertly Crafted for Superior Biological Filtration. These Durable and Reusable Filter Media Are Essential for Improving Water Quality by Efficiently Eliminating Toxic Ammonia and Nitrite. Their Versatile Design Suits Various Setups, Ensuring a Healthy and Vibrant Environment for Your Aquatic Life. Available in Convenient Sizes of 100g, 250g, and 500g, the Larger Quantities Include a Handy Mesh Bag That Simplifies Maintenance. Summary of Features: - Biological Filtration: Efficiently Removes Harmful Ammonia and Nitrite. - Durable & Reusable: Built for Long-lasting Performance. - Easy Maintenance: Cleans Effortlessly with a Rinse in Aquarium Water. - Material & Options: Made from Plastic and Available in Various Colors. - Includes Mesh Bag: Comes with 250g and 500g Sizes. - Weight Options: Available in 100g, 250g, and 500g..