A lot of good information coming here. I still think the starting point is an accurate representative water test for all the "usual" levels. You need a baseline. Then develop a plan from there. As far as winter aeration if thin ice is not a concern I don't believe too complicated to design such a system. You may want to offer up what aeration components you currently have to see if that equipment can also be utilized to some degree. A 12 acre lake (pond) may only take 3 hp depending on the layout and a few other factors.
