As much as I understand the liquid Splenda is in its purest state and dosn't have any carbs at all. However, when the put it into powder form they have to use some kind of filler to puff it out to make the powder form. That filler or puffer is what adds the carb. As far as I know you can't buy the liquid splenda but you can buy the powdered stuff. The liquid stuff is what you find in the diet soda's and such.

Hope this helps,
Tammy