The Ubbink FiltraClear 2500 PlusSet pond filter is a two-chamber filter system. The mechanical filtration (with filter mats and biological granules) takes place in the first chamber and the biological filtration takes place in the second chamber. This consists of a fine filter sponge, biological granules and a filter medium with a bacterial strain that ensures that the water remains clear. The UVC unit ensures that algae growth remains under control. The Ubbink Elimax pond pumps are high-quality products and based on the latest technology. The pumps use synchronous technology and are suitable for use in garden ponds, fountain basins and in combination with, among other things, water fountains and spray figures. The FiltraClear series consists of 2 sets: BasicSet: 1x Filtraclear and 1 x AlgClear, suitable pump must be ordered separately. PlusSet: 1x Filtraclear, 1 x AlgClear and 1 pond pump, this is a complete set.To keep the water in your pond clear and clean