BAK,
Structure is a necessity...I input limestone, Christmas trees, PVC structures made with 5 gal buckets, and made vented gutter drain pyramids for structure. There are a lot of ideas here on Pond Boss if you have time to peruse the archives. Cedar trees work well if you have some on your property that you can cut down, as well as rock structures as mentioned earlier. Good luck with your water clarifying project. Please post what you learn in the process...and as always, pics are worth a thousand words...
