The Aquascape UltraKlear 2500 UV Clarifier/Sterilizer effectively clears unsightly green water (pea soup) algae blooms. The UltraKlear 2500 is best with ponds up to 2,500 gallons in size with a maximum flow rate of 1,000 gallons per hour (GPH). Its technologically-advanced 28-watt T5 high-output UV bulb maximizes the performance of the clarifier, while the narrow contact chamber increases its effectiveness significantly. The UltraKlear's internal swirl sleeve optimizes UV clarification by increasing the contact time between the algae and UV bulb, increasing UV efficiency up to 50% over traditional UV clarifiers. An on/off indicator provides quick verification of bulb functionality and the electronic ballast ensures optimum wattage and bulb output. The Mechanical safety switch automatically turns bulb off when the ballast is removed. The UltraKlear 2500 can be mounted either vertically or horizontally using the included mounting brackets, and the easy-to-remove bulb and quartz sleeve make maintenance simple. The UltraKlear 2500 is also backed by a 3-year limited warranty. Aquascape is passionate about the products we produce, providing unique products, designs, and features that stand above the competition.