Okay your pond is not normal due to the steep sides, flat type bottom and deep average depth. It could qualify as a "quarry of sorts". Stone quarries, at least in my area, often have vertical to almost vertical sides and deep average depths. If you don't fertilize to increase the productivity and the productivity stays reasonably low the pond could be 'okay' not aerated. Okay is a relative term. As Sue and others have mentioned, it could do more harm to aerate it incorrectly compared to no aeration. The pond's design (morphometry) has pros and cons.
Last edited by Bill Cody; 02/12/13 10:42 AM.
