Hi esshup:
I considered some form of biological filter system. Like sucking the water through a section of rough rocks (lots of surface area) and back into the center of the pond. But decided it was too complicated and would have to be pretty big to have an appreciable effect on a pond this size. I like the idea of using desirable plants to take up the nutrients and deprive the undesirable plants.
I will send Bill a PM. Thank you for the recommendation. If our private discussion is productive, I will post it to help others.
Thanks again, and have a great Labor Day.
Backstroke
