Improve your aquarium or pond filtration with Oceanmax Bio Balls Filter Media, now available in 6-8mm and 8-10mm sizes. This 500g box provides bio balls with a high surface area to encourage robust bacterial colonization, supporting the breakdown of ammonia and nitrite for cleaner, healthier water. These compact bio balls are compatible with most filtration systems, require minimal maintenance, and offer a reliable solution for biological water purification. Suitable for both freshwater and saltwater environments, they’re the ideal solution for lasting biological filtration. Available in 6-8mm and 8-10mm — pick your size above.