CESFONJER 90Pcs Bio Porous Filter Biochemical Ball Media Water Material with Cotton for Fish Tank Pond Aquarium Waterfall Fountain(18mm) + 2 Pcs Bag

【Wide Application】-- Our bio balls can be used not only in biochemical filtration systems in seawater, but also in biochemical filtration systems in freshwater, perfect for using as fish tank filter, aquarium filter and pond filter media. 【Keep The Water Clear and Clean】-- Great help to restore the natural water quality, and provide the most suitable living environment for your fishes. 【How to Work】-- When the water flows through internal space, prolonged the time, using the nitrifying bacteria to achieve the effect of biochemical filtration. 【Large Volume】-- Strengthened the effect of filtering bacteria, lightweight and easy to carry. 【Quality Guarantee】-- Guarantee 100% refund, if you have any dissatisfaction on the quality of goods, please contact us, we are willing to send you a new goods or a full refund.