The new Sicce Green Reset Pond filters. External pressurized UVC Bio-filter is available in two models - 25L and 40L - with great filtration capacity for small and large ponds. First, the water is pushed through the sponges (mechanical filtration) and then through the bioballs (biological filtration) in combination with an effective UVC sterilizer lamp to guarantee crystal clear pond water. The innovative design of the Green Reset makes maintenance operations simple and quick. Three simple steps make cleaning a breeze. Ships complete with all media and fittings. Full backwash capabilities.