Aaron-
Here is the source:
http://www.boatbuilding.com/article.php?story=ChemotherapyforRot&query=chemotherapy%2Bfor%2Brot
Toxic antifreeze, not non-toxic antifreeze is used as a fungicide. Don’t know if this will aid your search. I’d try Pep Boys, since antifreeze also raises the boiling point of coolant and most cars need it even in warm places like LA.
Quent