Outdoor Water Solutions AWS0011 12-Feet Galvanized 3-Legged Aeration System Windmill New patent pending balcam technology that minimizes bearing fatigue with a 5-year warranty on the compressor Windmill is manufactured out of high quality 18 gauge galvanized steel and made in the U.SA. High air output up to 4.5 cfm of air at a maximum of 30 psi. larger check valves and upgraded 1/2" airline Can aerate ponds up to 2-3 acres, operates with low winds, adds oxygen and prevents pond stratification preventing fish kills System aerates pond from bottom up, reducing algae, bacteria and odor AWS0011 New patent pending balcam technology that minimizes bearing fatigue with a 5-year warranty on the compressor Windmill is manufactured out of high quality 18 gauge galvanized steel and made in the U.SA. High air output up to 4.5 cfm of air at a maximum of 30 psi. larger check valves and upgraded 1/2" airline Can aerate ponds up to 2-3 acres, operates with low winds, adds oxygen and prevents pond stratification preventing fish kills