Product Specifications Dimensions: 2" Unit: 36-7/8" x 8-5/8" x 17-1/2" 2" Unit with Wiper: 38-3/4" x 8-5/8" x 17-1/2" Wiper Clearance: 17" Number of Lamps: 4 lamps Electrical Draw: 120 Volt, 1.70 Amp draw Water Sterilization Measurements: Freshwater: 6,000?8,500 gallons Saltwater: 1,200 gallons Recommended Flow Rates for UV Dosages (End-of-Life): 30,000 µw/cm: 5,400 GPH (Maximum Flow Rate) 45,000 µw/cm: 3,600 GPH 60,000 µw/cm: 2,700 GPH 75,000 µw/cm: 2,160 GPH 90,000 µw/cm: 1,800 GPH (Minimum Flow Rate) Information for Reef Tanks: A UV dosage rated at 30,000 or 45,000 µw/cm (EOL) is ideal for reef environments. Using higher kill rates can destroy the planktonic food supply essential for reef systems. Information for Marine Fish (No Reef or Live Rock): For effective control of fish disease, a UV dosage rated at 75,000 or 90,000 µw/cm (EOL) is recommended. All UV dosages are calculated at the end of lamp life (approximately 14 months). Disclaimer: Aqua Ultraviolet does not recommend utilizing Wipers with Salt Water. If used in saltwater applications, the warranty on the Wiper parts will be voided.