Mudhole,
Awesome points, thank you.

PH? I'm not concerned with what it is. If the PH is conducive for healthy fish, I'll have a healthy fish pond that I might swim in once in a while. A crystal clear pool/pond is not what I'm after.

The pond I have is somewhat kidney shaped and measures about 80' X 12' and sits on about two acres.

What I'm really after is a nice, natural, way to get/keep the pond clean and healthy enough to not be an eyesore and receptive to an occasional swim.

As best I can tell, someone came over with some digging equipment, made a hole, filled it with water and said, "Voila! A pond!". I've owned it for about 5 years and do my best to keep surrounding run-off to a minimum, keep as much twigs, leaves and other detritus out of it, and installed an aerator a little over one year ago. It's all helped but what I currently have is a somewhat "cleaner" "mudhole".

One point you mentioned, and that I thought of but had no info on, was how much water needs to be pumped through the filter. This point alone may be a requirement that I am not willing to meet.

If you (or anyone else) has any better ideas for me, please do share.

Thanks again!