Understood. I have an aerator working, soon will have the waterfall (with pump) as well. Since I want this to be a swimming / fishing pond (in that order of importance- I've been told if you say "swimming pond" that's what that means), so nice clear water is obviously a priority. This has probably been explained to me already (maybe more than once), but please indulge me by telling me the best way to achieve what I need. Thanks!