The material is same as old tipe but new one has Hole at center of the Bacteria House that make more Surface area!
Moreover, since a large number a big hole, water permeates to an inside and raises sufficient filtration effect.Adhesion of bacteria appears clearly in about about three weeks after installation of a bacteria house, and an effect shows up.In the hole of the size of a bacteria house, and a static electricity-action, floating matter is caught effectively and they are decomposed promptly. The transparency of water rises in a bacteria house.
Fish tank filter material drip box nitrification bacteria nano-quartz bacteria chamber bar filter 鱼缸过滤材料滴流盒硝化细菌纳米石英细菌屋棒过滤器