>> "anything else in your electrolytes?"
Looking at the label of CamelBak's "Elixir", it's mostly sodium and potassium compounds. I don't see anything that, to me (with a Very untrained eye), looks like carbs.
I don't have a container of Nuun handy.
Very helpful info on the carbs issue though, as I've thought of switching to Hammer (HEED, or another of their products), which does indeed have other ingredients (carbs).