Pond Boss Forums INTRO Questions & Observations Bacteria

Thanks for the valuable input! Being in the 'pond aeration' business, it seems everywhere I turn people are selling bacteria. If oxygen is present there will be aerobic bacteria. Why do bacteria levels go back down to normal levels so quickly after a treatment. If there is an unlimited food source and plenty of oxygen to go around, why do they die off so quickly and need to be added again? We know there is odor, nutrient and muck reduction with aeration alone and I question if adding large amounts of bacteria is neccessary. From what I've seen and heard it is quite expensive and is an ongoing treatment. I am often asked my opinion on this subject from people trying to solve their water quality problems. I'm not against it, I'm just looking for justification.