AquaTops specially designed In-Line Ultraviolet Sterilizer maximizes UV exposure in a compact, easy-to-install unit. Water traveling through the IL-UV Series is exposed to UV-C light, known as germicidal grade UV Light. The result is clean, crystal clear aquarium water. The multifunctional UV sterilizers can be installed in-line or as a hang-on unit. Simply connect to a water pump, power-head, or on the return line of a canister filter. The IL-UV Series includes a replaceable UV Lamp, various diameter barbed fittings and is suitable for both fresh and saltwater use.