More cons for the windmill. Electric aerators can be less costly (up to 1/2) than a windmill if one is creative and willing to do some stuff yourself. Electric aerator is quicker to install compared to assembling and erecting a windmill. Windmils don't produce very much air esp in lower wind speeds of 5-12mph. Lower air volume of windmills result in less mixing energy and fewer turnovers per day of the pond, both very important features. Windmills require about 3-4X more maintenance over the system life than a rotary compressor. They don't produce much air in middle of the hottest part of the summmer when aeration is needed most. Maintenance is off the ground for mills instead of on the bench top for electrics. Maintenance is simpler and quicker with the rotary compressor. If I have a choice between electric compressor and windmill it will be electric compressor every time where there is power within 400ft of the pond.

Last edited by Bill Cody; 03/31/12 04:00 PM.

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