Backwater G-Man: Good aeration can be done for a pond up to 1-2 acre depending on shape for $380-$480 (one maybe 2 diffusers). You have to do a do-it-your-self system. You have to build your own diffusers and scrounge or buy the other parts and pieces yourself; take some time and put it together so it works correctly, but it can be done and takes a little time once you have some basic knowledge.
Basic or main cost is a rotary vane compressor @ $325-$330. Alternative way, spend $900-$1200 for a package system.
