It has been 4 months since I posted about the bubbling in our pond. There are still these 7-8 areas of constant bubbling in the deepest part of our 1.5-acre pond. I plan on taking some photos and bringing them to the conference this month along with our water quality testing results. The pond is still a bit muddy but at full pool. Any more thoughts about what these darn bubbles are? Still just air escaping from debris? The area where the most bubbling occurs did not totally freeze over this winter.