If you have dingy or an unclean looking aquarium you will want to invest in an AQUATOP In-Line Ultraviolet Sterilizer which maximizes UV exposure in a compact, hang on unit. Simply connect to a water pump, power head, or on the return line of a canister filter with a cable length of 60”. The IL-UV Series includes a replaceable UV-C Lamp, barbed fittings of 3 different sizes 5/8″ -3/4″ -1″. This model has a wattage of 5 and a voltage/frequency of 110-120V/60Hz. The max flow is 105 GPH with a shipping weight of 2.2 lbs and we do offer air and ground shipping.