“life” series filter is suitable for fish ponds, waterscape pools, aquariums and other facilities requiring biological filtration. The installation and operation is very simple and the function is very complete. It is also environmentally biological filteration refers to the breeding of beneficial bacteria inside the cylinder attached to the filteration media after certain period of time. The formation of a thin biofilm by the beneficial bacteria can effectively convert the ammonia and industrial nitrate inside the filter into nitrate and the digested