EasyPro Rocking Piston Aerator Deluxe System 1/4 HP provides optimal oxygen dispersal in up to 2 acres of water systems! This shore-mounted air compressor pumps oxygen through the hose into a special diffuser at the bottom of the pond. This location is the perfect spot for delivering oxygen where it's most needed. The rising bubbles also stir up the water, encouraging vital circulation & preventing stratification. Experience a balanced, productive ecosystem with the help of this reliable system!