I was just about to ask this same question when I came across this thread. I'd like to put a little spin on it now.

When I switched to running my bottom diffuser I slowly built up to running 24/7 once air temps weren't trying to boil the pond. My main reason for running constantly wasn't concern as much over O2 levels as it is over nutrient load. My reading has lead me to understand that running aeration helps to reduce that load by providing O2 for decomposition and allowing those nutrients to be dispelled into the atmosphere thru gases. If I'm wrong, please correct my thinking here.

My question is...how much affect does aeration actually have on reducing nutrients?

I relinquish to the experts.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!