Laguna UV Sterilizer/Clarifier 55-Watt, Ponds up to 5000-Gallon Provides beneficial water conditions for your fish For ponds between 2000-5000-gallon Flow rate of 1300 GPH and fit connectors allow connections to 19, 25, or 32 mm (3/4, 1, or 1-1/4 inches) hosing, making in-line pond installation a snap Unique spiral chamber for longer UV exposure to water 3 -Year warranty