koi5000The Kockney Koi KF5000 Vortex is a multi-chamber filter that is perfect for use in a Koi pond up to 5000 litres in size. However, used in lhtly stocked or fish-free ponds it can cope with a largerRotary Drum Filter (RDF) is an automated filtration system for Koi ponds. It acts as an excellent mechanical filtration to automatically remove the debris and fish waste out of the water column