Algae blooms, or "green water" in ponds, can be a difficult issue to address safely and effectively. Not anymore! The Aquascape UltraKlear ® UV Clarifier/Sterilizer uses a technologically-advanced T5 high output UVC bulb, making it more efficient than traditional UV clarifiers. The Aquascape UltraKlear® UV Clarifier/Sterilizer features a swirl sleeve that helps direct the water around the UV bulb, creating more contact time and increasing UV efficiency up to 50% over traditional UV clarifiers.