Allows you to provide filtration for a pond without the need for mains electricity. Whilst there is no UVC unit, the filter comes wtih plenty of foam and Bio media to provide a good level of mechanical and biological filtration. Working in a very similar way to an All-in-One pond filter, the pump (not included) fits inside the box and the whole box is submerged. It can be connected to an existing or new solar pump. IMPORTANT: Not designed to keep ponds with koi or heavy stock of fish clean. PLEASE NOTE THIS FILTER DOES NOT HAVE A UVC