Kevin;
I had problems with my pond(160x100)droping in water level about 2 to 3 feet late every summer.The well I put in was suppose to get 20gpm it only got 15gpm,but that well is the best thing I did for that pond. It is amazing how 15gpm can raise the level in the pond just over night. I cascade the water down some rocks never had an o2 problem in ten years....jimmy