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FILTERATION PERFORMANCE:Aquarium Filter Bio Ball that helps clean your water naturally, beneficial to oxidation of oxygen convection exchange, and for reproductive growth of with a huge biochemical surface area. BIG SURFACE AREA:Bio-sponge inside provides more surface area for growth of beneficial Bio-spiral . Many flake structure, internal porous, great for any freshwater or saltwater. BETTER PERFORMANCE:The bio ball is idea for external and pressurized filters in aquarium tank, pond filter and fish farm water treatment. SAFE MATERIAL: Good to use in different type of filters, encourages growth of biological colonies, more capacity than most biological filter media, reduces and controls harmful and nitrate. PROMISING SHAPE:16mm in diameter. Packaged in mesh filter bags allowing easy cleaning, promote gas exchange and increase dissolved oxygen levels.