JBL SintomecSintered bio glass rings for the breakdown of pollutants. Key Features: Biological breakdown of pollutants in fresh and saltwater aquariums: sintered bio glass rings for the use in aquariums. Easy to use: insert bio filter rings as second last filter stage. Intensive water clarifying thanks to biological filtering: microorganisms settle inside the filter material and break down pollutants. Extremely effective: conical tunnel pores and 5mm wall
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