A windmill will be more maintenance than an air compressor system. I sold windmills for years and still have one operating from 1988. The diaphragm and gear box bearings are a 'bear' to work on up off the ground 12-20 ft. High winds 70mph+ can cause big damages. Check valves can be troublesome and interfere with diffuser operation. I am seeing alot of earlier aeration windmills not working now due to neglect and people not knowing what to do. A windmill will be initially more expensive than a cheaper do-it-yourself small electric system for a small pond such as yours.
An electrical system is reliable and produces high amounts of air when it is needed most during the calmer wind months of Jul-Aug. See below for economical systems for what some members are using and testing and they seem to be working okay so far. Without weighted airline and only one diffuser you could be effectively aerating your small pond for about $200-$300. PM me or those with Eco systems if you want some specifics about where to get parts. The links provide good information. Your little 0.1 ac pond does not need a sophisicated expensive system to turn it over. Don't expect an aerator to solve your algae problems. An aerator can improve water quality but improved water quality can also grow lots of algae. Algae growth and biomass are dependent on nutrient load. More nutrients = more algae. Manage the nutrients.
Lowest cost - unproven long term:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=300588#Post300588Higher cost Do-it yourself. $480-$600. Proven long term 20-40 yrs.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=301242#Post301242Check very good vendors here for high quality aeration systems. These vendors will also be able to provide pond management advice to compliment their aeration systems.
