Since this is my aerator, I have to reply. First of all, the 0.15 cfm is actually 0.2 cfm. The Koenders windmill is supposed to put out 1.5 cfm (crunch the numbers on the diaphragm, rpms, etc.) and costs about five or six times as much. Not everyone wants or needs a farm type windmill. This aerator
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7712984701 was designed to require no assembly other than attaching the windmill to a post and attaching the airstone/check valve to the air hose. I have been selling a non-floating version on eBay and elsewhere since June with excellent feedback from customers and only one service failure (a bad pump). The customer reinstalled the new pump himself in about 15 minutes. Watch for larger units in the future, floating "FloatAerators" and another aeration system which will shake up the pond business.
