Originally Posted by Bill Cody
Diquat is not a systemic herbicide it just mostly kills the top vegetation on most weeds and watershield thus it just kills the tops and leaves the roots intact thus their regrowth.

So basically anything would be better than it for watershield? lol

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=546830&page=1