ZenBlue CUV-211 Pond and Aquarium UV Sterilizer/Clarifier with UV Bulb, 11-watt 11W UV Sterilizer Includes 3 Inlets/Outlets (One in/Two out or One in/One out) Easy Unscrew-release for Bulb/Quartz Maintenance Supplied with external ballast 1 Year Warranty (Bulb not covered in warranty)