Awesome post Greg, could not have said it better. In my opinion Todd had a goal that was unattainable. Watermeal is barely treatable with anything but Fluridone. And it is almost impossible to spot treat and save other plants, it is the strongest of all of them.
Summer is possibly too late after heavy infestation. Best to tackle it with Fluridone first emergence in Spring. I was under the impression it was not a very large pond, but even at that, high costs and retreatment this time of year are almost inevitable. Me, personally, would nuke the pond with Fluridone, kill them all and retreat if I had to, in the Spring. I'd manually skim it for now to avoid the crash.
