I have been tasked with returning a pond to productivity. It is 100% covered with duckweed and watermeal. A few days with 6 inches worth of rain flooded the pond and sent watermeal and duckweed into a healthy stocked pond. Now, my task is to treat the larger with fish. (I'm using the PondRestore Ultra kit for Lakerestoration.com)

How do I maintain concentrations when we are receiving this much rain at any given time?

Also, any other advice as far as treatment, products and techniques are appreciated!