Greatly increases the performance of any pond filter! The Oase Oxytec pond aerator is an air dispersal system designed for use with external air pumps such as the Oase's Aquaoxy 450 Pond Aerator. It provides the dual benefit of superior air dispersal (oxygenation) and increased surface area (beneficial bacteria growth), significantly increasing the performance of all pond filters. Blends into the pond or water garden. 1 year warranty.