Pond Boss Forums AERATION Systems questions New System Recommendation

I'm happy with mine as well. As Augie says, you'll want to go with sinking/weighted air line if you go with fishpondaerator system.
They use the soaker-type hose filled with smaller SS ball bearings for a diffuser-which works absolutely fantastic btw.
The idea of a bottom diffuser is to circulate water-not induce air...
The amount of air and size of air bubbles has a direct correlation to how much water is moved. Remember that "X" volume of air has more surface area in smaller, more numerous bubbles than it does in few, larger bubbles, so more water is circulated by using a good diffuser. The lower water column usually has lower dissolved oxygen so by bringing that water to the surface it is exposed to the atmosphere where oxygen mixes with that layer.
I also believe when using bottom diffusers you can create too much volume and draw sediment that shouldn't be.
Generally speaking, surface aeration can be better for O2 requirements for fish, but there are other advantages of supplying O2 to deeper water, I just believe it should be a gentle roll.