This Aquarium Hang on Filter is suitable for fresh or salt water aquarium tanks up to 90 Litres. Filter Operation 1. The filter draws water up a lift tube and skims the surface water. 2. Then into a filter chamber where the water is pushed through a series of filter media (back-to-front) which can provide chemical, biological, and/or mechanical filtration. 3. After the water has gone through the filter media, it flows over the overflow like a waterfall effect and back into the tank. Features 1 x Active Carbon Pad and 1 x Sponge. 1 Stage filtration for Mechanical, Biological and Chemical filtration. Waterfall effect increases oxygen levels in the water. Adjustable water flow. Easy hang onto any size aquarium (without Lid) Specification Power consumption: 5w Max Output: 500L/h Dimensions: 155 x 130 x 290 mm UK 3 pin plug with 1.5m of cable. Voltage: 220-240v Comply with: CE, ROHS & TUV. 12 Months warranty.