compressors will help you keep your pond healthy. The
time that an aeration system is most important is at night and during
cloudy and still days because these are times when there is no sunlight
for photosynthesis to produce oxygen.
Of course, just because there is not as much oxygen
does not mean that it is not still in demand. And you do not want
to have to worry about oxygen depletion.
Many people prefer electric aeration systems, because
they are generally proven to be quite dependable. There are, however,
windmill and solar aeration compressors available, as well. These
are good for ponds that are far from electricity. They are also good
if you simply want to use the most environmentally friendly method.