This Internal all in one UV filter pump has been designed to be fully submersible in fresh or salt water aquarium tanks up to 120 Litres and is easy to install and maintain. The water pump enclosed pumps the water through the UV light cavity this is where the UV light clarify's the water and stops it from going green, killing off algae, bacteria, and also kills micro-organisms and parasites which may cause fish diseases. Features Designed for submersible use only. Complete with suctions caps for attaching to the side of your tank. Replaceable filter sponge inside filter. Venturi aeration nozzle supplied to create bubbles, increase oxygen level of returning water. No air pump needed in principle. Venturi effect: As water is pumped back into the tank, it can also be aerated by a venturi pipe. This accelerates the water flow and draws in a stream of air from above the surface. High performance, quiet operation. Specification Power consumption: 4w UV Power: 5w Max Output: 500L/h Height-Max: 0.4m Dimensions: 95 x 80 x 265 mm UK 3 pin plug with 1.5m of cable Voltage: 220-240v Comply with: CE, ROHS & TUV. 12 Months Warranty