Replacement part SunSun HW-403B Bio-Balls ("Bioballs") ø 28 mm Aquarium external filter

Bioballs are a filter medium suitable for any external filter. They can be reused multiple times and are easy to clean. Suitable for freshwater and saltwater.

Bio-Balls – Bioballs

Bio-Balls are used in aquaristics as both a mechanical and biological filter medium. They provide a large surface area for bacteria colonization and are considered high-performance filling material, especially in large filter systems. Unlike many other filter media, Bioballs offer virtually unlimited lifespan, making them a popular and cost-effective medium, particularly in pond filter systems, trickle filters, and chamber filters.

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