JBL MicromecSintered bio glass balls for aquarium filters for breaking down pollutants. Key Features: Biological breakdown of pollutants in fresh and saltwater aquariums: sintered bio glass balls for the use in aquarium filters. Easy to use: use biological sintered glass balls inside the second last filter stage. Intensive water clarification through bio filtering: microorganisms settle on the filter material and break down pollutants. Highly effective: conical
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