RC51,

It looks like a simple single diffuser would do the job easily in your pond. I estimate that your volume is 1,840,931 gallons. A single diffuser depending on the brand you select should be able to turnover that volume at least 2.1 times per/day at 7 foot of depth.

Keep in mind that since no aeration has been ever done to this pond that you absolutely must follow start up guidelines that will allow the H2S and CO2, hydrogen sulfide gases and carbon dioxide, to escape a little bit each day. We just went through this with Farmer Rick and he is jow finally down to the bottom of his pond just about ready to go 24/7. It took some time and patients but in the end, he is getting the results that he planned.

Rick did purchase (as a mother's day present) a display aerator too. This allows him to have a secondary "Emergency" aeration capacity while receiving the benefits of a nice display too. Redundancy is real nice when your fish are at steake.

Best fishes,