I was at Lowes this weekend and looked at a "Pond Tablet" for garden ponds. Much to my dismay, Diuron was one of the A.I. (active ingredients)!

My assumption on how they get by the non-aquatic labeling is if the garden pond is self-contained, it can be used. It may be also that the A.I. is such a small amount that it would not be damaging if it was released. Just an assumption, but still suprising.