Simply place the GKM 24W into your aquarium and have clear water in days! Perfect for saltwater & freshwater aquariums up to 120 Ga. (450L) Simple 1-2-3 installation Comes with slow flow water pump & the zigzag flow within the bulb, increases the exposure time of water with the UV bulb. Submersible assembly with suction cup mounting, easily hidden behind ornaments & plants and cutting back on tubing (possibly leaks) around your tank. Can be placed vertically, horizontally or in a filter sump. Dimensions: 4 x 4 x 17". UV bulbs last for 6~9 months (constant ON), once your water is clear, there is no need to keep your UV ON 24/7. Connect it to a timer, this will help increase the lifespan of the UVC bulb. LED signals need for a UV bulb replacement. Sealed UV bulb design – avoid UV housing deteriorate, fresh with every bulb change. 12V low voltage design. Pack of Bonus Sponge included. UL & cUL listed, GS by TUV for product safety Model #: AAUV24W (North America), GKM24W (Rest of the world) * Lamp contains Mercury. Manage in Accordance with State Disposal Laws.