Cloverleaf Professional CL pond filters are a good value range of multi-bay filters suitable for the Koi pond. Key features of this well constructed compact CL range are the options of the filters being pump or gravity fed (meaning below ground), whilst being very simple to maintain. The incorporation of vortex bays, and skilful use of mechanical and biological bays using quality mediums encompassing good water flows are further attributes that make the range a superb and sound investment. For very large ponds all filters can be happily installed as pairs - linked to separate pumps or bottom drains. All systems are supplied complete with valves and waste kits, together with a heavy duty lid.