This filterpump system is even good enough for koi reduced max koi pond size of 4500 litres. Save £19.99 on buying components individuallyThis 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 18w 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 3000 filter pump is economical to run and can handle 6mm solids.