Perfect solution for goldfish ponds up to 20,000 litres (4,400 gallons) or mixed stocks including koi up to 10,000 litres (2,200 gallons). The compact multi-bay box filter included 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 is a doddle to clean thanks to the quick action back flush. A full de-sludge is also possible 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 pond pump can handle solids up to 10mm and has very low running costs of just 65w (skimmer not included in this set). This set contains the following components (please click links below for more information): • Hozelock Aquaforce 6000 pond pump (note: skimmer not included when purchased in this set) • Lotus Clear Pond 25 box filter * Saving made when compared to buying items separately.