The 3 inch Lifeguard Aquatics Pro-MAX Ultraviolet Sterilizer helps to eliminate and stop the spread of harmful microorganisms, infectious diseases and free floating algae. Ideal for use in small and large ponds, as well as freshwater and saltwater aquariums, this solution helps dramatically improve water quality and provide your aquatic pets with a more stable, balanced environment. Boasting a flow through design with fewer restrictive angled inlet and outlet ports, the Lifeguard Aquatics Pro-MAX Ultraviolet Sterilizer requires much less plumbing than other products and can be fit into many tight spaces for increased freedom of use and versatility. Features a high output uv bulb, internal protective sleeve and an incredibly unique UL listed ballast that automatically countdowns the number of days until you need to replace the bulb. The maximum operating pressure is 30 psi and has an energy efficient output of 25 watts. Features a flow rate of 1000 gph and is well suited for aquariums up to 130 gallons and ponds up to 2400 gallons.