This filterpump system is even good enough for koi suggest reduced max koi pond size of 9000 litres. This compact multi bay system employs filter foam cartridges, brushes and Flocor media to ensure your dirty pond water is thoroughly filtered. It has a powerful 25w UVC unit built into the lid to keep your water clear of green water and it's a doddle to clean by utilising the quick action back flush. A full de sludge is also available by simple hose attachment all filter media is held above the filter floor so valuable friendly bacteria will not be harmed by this process. The pondpush 6000 filter pump is economical to run and can handle 6mm solids.