Nano corner filter for aquarium size up to 20 US gallon efficient, quiet, compact large surface area for filtering bacteria safe for shrimps and crabs baby filter guard, filter extension are available and sold separately. Replacement filter media available, should be replace every 6 weeks and sold separately. 110V, 2 watts, us plug the Nano corner filter is a high-performance device with a pump delivery rate of 150 L/h. The pump runs so smoothly and quietly that it is practically inaudible. Its modest power consumption of just 2 W additionally helps to conserve natural resources. The water flow rate is infinitely adjustable and the filter outlet can be rotated by 90° to enable the flow of water to be flow in any desired direction. The filter incorporates a nozzle tube with integrated cleaning slide and a Mini-Brush for simple cleaning of the nozzle openings. The narrow intake openings and a very fine-pored preliminary bio foam ensure that the Nano corner filter is also safe for young shrimps. Cleaning The filter element is simplicity itself: just grip the outflow pipe and pull the filter forward. The rear half of the filter housing remains in the aquarium. Wash The filter element in a clean bucket with aquarium water, to avoid harming the important filtering bacteria. Replacement filter media available and sold separately.