No, I have tried that and after the level dropped 2 feet I let the creek back in. I am sure there are some nutrients coming in from the creek but I don`t think they are that high.Plus I do like to have a good flow of water going through to keep the pond from becoming stagnent. The source of the creek is a spring which is 3/4 mile upstream. I believe that most of the nutrients are coming from leaves and grass falling into the pond plus some run-off of chemicals from the lawns upstream. That`s why I think the Vertex system will provide me with some relief.
I also have realized that my grass carp have been in about 4 years now and after reading the posts on that subject I am going to start a yearly program of putting in new and removing old grass carp.