I'm told that this usually happens in Ponds further North (but I did find another forum where someone in Illinois had the same exact problem and also had aeration). Problem lies in the loops--our thoughts at present is more weight on the loops, even thought the weight was correct--just not correct for my particular situation. We will put a splitter for two arerator heads in the pond so we can leave the one on the deep side in summer and switch to low side of pond in winter. Mind you, the loop installer IS reputable to the area...the odds of this happening were probably not high--when the tech called him, he knew EXACTLY what had happened. I hope my posting this will help others who are looking at pond loops to take a total look at the WHAT IFS, are you aerating?..........
