Sintered Bio Glass Balls for Aquarium Filters to Break Down Pollutants. Key Features: • Biological Decomposition of Pollutants in Freshwater and Saltwater Aquariums: Sintered Bio Glass Balls for use in aquarium filters. • Easy to Use: Utilize the sintered bio glass balls in the penultimate stage of the filter. • Intensive Water Purification through Biological Filtration: Microorganisms settle on the filter material and break down pollutants. • Highly Effective: The ideal conical pores create a stabilization area of 1500 m²/liter for beneficial microorganisms. Intensive breakdown of ammonia and nitrates.