Just wanted to provide some follow up to my earlier post. I actually elected to go with the Navigate granular product initially to see if it willl have any effect - it it doesn't work I am going to scale up to the liquid products you all recommended. Honestly the granular is just much easier for me to apply and the product warnings on the liquid product kind of gave me the heebie jeebies...

Good news is the Navigate does seem to be working - not 100%, but definitely having an effect. I applied about 3 weeks ago. Other good news is I have small bass and bluegill making beds in portions of the pond that were previously choked out with water shield which is exactly what I was hoping would happen. Thanks for all of the help and good suggestions!

Cullen