The Aquascape UltraKlear® UV Clarifier uses a technologically-advanced T5 high-output UVC bulb to eliminate green water. The UltraKlear UV Clarifier features a swirl sleeve which directs the water around the UV bulb, maximizing contact time and increasing UV efficiency up to 50% over traditional UV clarifiers. It is simple and easy to use, install, and maintain and can be mounted horizontally or vertically.