I purchased a home with a one acre pond. It was totally covered edge to edge with Water Meal. Also I could not catch a single fish in it. I decided to us Clipper with a surfactant. I was not concerned of fish loss since I believe there were none so I hit it pretty hard with the sprayer. So far this year I've had no Water Meal or Duckweed. I put some fish in last year and also this year. I've only seen two floaters which were right after thaw.