Yes, the VC-17 people added Biolux
to the original formula, but it still contains the same quantity of copper powder as before. I haven't noticed any decrease in the performance in Holland, MI since the biolux was added. In fact, I believe that this was the first year that I used VC-17 plus exclusively (previosuly, I was still using up my supply of the original stuff), and there was NOTHING on the bottom of my boat. That could be because the boat was on the hard for the month of August (it takes a LONG TIME to get a new bow pulpit from Catalina), but it was in the water from early May through July, and then again from the beginning of September through yesterday, so I would have expected SOME slime, but the yard-man commented on how clean the bottom was.SteveAlchemist C-320