WL-BFG bead biological filter is a closed pressure filter, not only designed with nice and modern apperance, but also minimizes the size of filtration system compare to the traditional one. The installation and operation is very simple, and function is very complete. It provides mechnical filtration and biological filtration at a single unit, with bobbin-wound fiberglass reinforced tank, 6-way multiport valve, piping, circulation pump, air blower, control box and base.