Actually under aerating can be worse than doing nothing. If you don't aerate, chances are you have some dissolved oxygen in the top layer of your pond. Granted, you run the risk of a turn over if it rains, but atleast there is some livable space near the surface. If you underate, you mix the bad water with that surface layer with out enough force to bring oxygen levels up and bam! You have low oxygen top to bottom. We are conducting a case study from a lake on the west side of FL. The lake owners installed an undersized system and not only killed every living organism in the lake, but also birds were killed and people were sicked by the gases released. We had to come in and accurately map the lake, triple the aeration, and go gradually. We have some GREAT data from this project.
