I have a small pond that is a real PITB to use for training because of the watershield that takes over every summer. It's not a big pond, but it's water. It has a few fish as well that my hubby would rather not kill off. We've looked into granular 2-4,D and that seems to be the way to go. However, I know there are folks here who have a greater knowledge of pond maintenance and I was hoping to get an idea if there is a brand of 'weed killer' that would be 'best' or most efficient.