This pump and filter system is even good enough for koi ponds with a capacity of up to 9,000 litres. The compact multi-bay box filter 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 thanks to the quick action back flush. A full de-sludge is also available via a simple hose attachment (all filter media is held above the filter floor so valuable friendly bacteria will not be harmed by this process). The filter pump provided is economical to run and can handle 6mm solids. This set contains the following components (please click links below for more information): • PondXpert UltraFlow 6000 pond pump • Lotus Clear Pond 25 box filter * Saving made when compared to buying items separately.