This kit 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 so as to provide a good level of mechanical and biological filtration and is suitable for goldfish/nature pond with a volume 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. This set contains the following components (please click links below for more information): • PondXpert SolarShower 800 solar fountain pump • PondXpert EcoFilter 4000 solar filter IMPORTANT: Not designed to keep ponds with koi or heavy fish stocks clean.