Allows you to provide filtration for a pond without the need for mains electricity. Whilst there is no UVC unit, the filter comes with plenty of foam and bio media to provide a good level of mechanical and biological filtration. This kit would be suitable to filter a goldfish/nature pond of up to 1,500 litres. It works in a very similar way to an all-in-one pond filter as the pump fits inside the box and the whole box is submerged. NB: Not designed to keep ponds with koi or heavy fish stocks clean.