Overview FRESHWATER ONLY ? The Aqua Ultraviolet Classic Inline UV Sterilizer 25 Watt in Black with a 3/4" barb connection is engineered for ponds, aquariums, and water features. With a rugged design that allows for quick installation and easy maintenance, this UV sterilizer delivers clear water in 3 to 5 days?sometimes even overnight?when properly sized, installed, and operated according to instructions. Key Features Efficient Water Treatment: Sterilizes freshwater systems, reducing harmful bacteria and controlling green water. Dual Functionality: Sterilizer Mode: Effective for freshwater ponds between 500 and 1,200 gallons, achieving a flow rate of 1,200 GPH at 30,000 µw/cm. Clarifier Mode: Clears freshwater ponds up to 4,000 gallons. Saltwater Application: Can be used as a sterilizer for salt water up to 150 gallons, with a flow rate of 400 GPH at 90,000 µw/cm. Rugged and Reliable: Designed for quick installation and easy maintenance, ensuring dependable performance. Guaranteed Performance: Delivers crystal-clear water when sized and operated as specified by Aqua Ultraviolet. Product Specifications Wattage: 25 Watt Application: Freshwater Sterilization: 500?1,200 gallons (Flow rate: 1,200 GPH at 30,000 µw/cm) Freshwater Clarification: Up to 4,000 gallons Saltwater Sterilization: Up to 150 gallons (Flow rate: 400 GPH at 90,000 µw/cm) Connection: 3/4" barb inlet/outlet for seamless inline integration Color: Black Ensure a healthy aquatic environment with the Aqua Ultraviolet Classic Inline UV Sterilizer 25 Watt?a proven solution for maintaining clear water in your freshwater systems.