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Originally posted by bobad:
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Pumping air is cheaper and more efficient than pumping water. Solarbee units lift water
Hmmmm... aeration benefits aside, I have trouble imagining that air bubbles can circulate water as efficiently as direct water pumping. (watt for watt, of course.) Am I wrong? Probably so! \:\)

I had no idea there was a commercial solar powered circulation pump on the market. I was planning to build my own. There is no end to the things I have learned here over the years.
There's a lot less energy lifting water with air as air naturally rises through the water column vs. forcing it up (which is what you do when pumping). However there is a limit as to how high you can lift water with air above the natural water level, but sinces it's not necessary with diffusers it's irrelavant.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.