Tower Packings, Ceramic Balls, Molecular Sieve manufacturer / supplier in China, offering 16mm 36mm 56mm 76mm PP Plastic Back Bio Ball Nitrifying Bacteria Carrier Aquariums Filter Media, 155X35mm Aquarium Filter Media Far Infrared Bacteria House for Koi Pond Filter System, 155X35mm Far Infrared Bacterial House Ceramic Column Filter Media for Koi Pond and so on.