Condition: 100% Brand New Item Type: Hollow Bacterium Cultivation Ball Material: Sand Stone Color: As Pictures Shown 1Hollow design, improve nitrification reaction, accelerate filtration, make water quality more healthy. 2Purifiy water quality, more conducive to the growth of organisms, suitable for seawater tank and other large fish tank. 3Stabilize PH value, add minerals, release trace elements, let fish grow more healthy. 4To accelerate the diffusion of nutrients in the filter material and promote the growth of nitrifying bacteria. 5Reduce the frequency of fish tank water changing to ensure the long-term health of water quality. 6Strong adsorption, a large number of micropores quickly absorb metal ions harmful substances, filtration effect is remarkable, is required for water purification filter materials. 7The bacteria culture ball can be used on both seawater and fresh water. 8Used for upper filtration, bottom filtration and outer filtration of fish tank.Put the hollow bacteria cultivation ball into the net bag, and then put in the filter device. It is recommended to clean it once every three months to achieve a cleaner filtration effect.1 x Pack ofHollow Bacterium Cultivation Ball1 x Net Bag