This Outdoor Water Solutions Pond Aerating Windmill Kit Includes everything you need to build your own wood windmill tower, including instructions, cut sheets and hardware. 73in. dia. galvanized steel windmill head pumps up to 4.5 CFM of air at up to 30 PSI, thanks to the high amounts of torque generated by the windmill’s large size. Capable of aerating ponds up to 30 feet deep, using a compressor with BalCam technology.