OASE BioPress UVC 1600 Pond Filter The BioPress UVC 1600 is a compact pressure filter with built-in 9W UV Clarifier and cleaning mechanism that ensure clear, healthy ponds up to 1,600 gallons. This pressure filter is ideal for supplying high-elevation waterfalls. Varying filter media is included for the best filter biology and effective nutrient decomposition. Integrated EPA-registered UV Clarifier eliminates bad bacteria, green water and cloudiness. In addition to the filter foam, bio-media offers large surface area for beneficial bacteria to settle; they are able to move freely in the water flow.