I would think there would have to be a limit. But from what they show on their feeding schedule chart (at least the one that comes with the Jungle Juice three part line), they show using different additives at different times of the plants growth. Also, they show to use a little less of the base nutes, and use a consistent amount of them from start to finish. So while you might be able to add everything at once to a res and get it to work if you used the right amount of each, I don't think that's the recommended way to go about it.