Another concern for windmill use in a 1 ac TX pond is it does not create a strong enough circulation even in good wind to mix well a larger 1 ac pond during the heat of summer when chance is high for summer kill. Windmill circulation actually works best in winter in northern places / locations where they were first developed (Canada-Koenders). Southern copycats "jumped" on the technology without knowing the complete theory of windmill circulation. During winter water mixes a lot easier and more much more water volume can be impacted compared to the same amount of air diffuser circulation in summer when stratification and resistance to mixing is strongest.
