Designed for mid-sized koi ponds, the Cyclone 1 Settling Chamber provides excellent mechanical filtration in an easy-to-clean unit. These Vortex filters can easily be added to any established pond with little work. The 4" output allows for no restriction or backflow in the filter. This Settling Chamber works best as a Gravity Fed System, however, can also be a Combination System. The As a bonus, the Cyclone 1 Settling Chamber can be customized to fit your needs with additional 3" or 4" inputs. Unlike plastic cones, the Cyclone series of filters are constructed of heavy-duty fiberglass and will not warp or distort. Every system is made in the USA and features our exclusive Lifetime Filter Body Guarantee.