I have to agree with Quarter Acre.

I run my aerator 8hrs every night on a timer. This is my first summer and the improvement in pond health is already easy to see.

Half acre 30 year old farm pond, Mebane NC. Aeration & feeder.
LMB, CC, SC, BG, HBC, two no account welfare carp and nine seasonal Tilapia that all the other fish are terrified of.