The calculator suggests so many products, it seams like a lot of the products overlap on what they provide. If i were to buy just micro,grow,bloom, big bud and something like voodoo juice would all the amounts stay constant, or would they have to adjust for the other missing products?

I guess my main question is what are the essentials and what can be left out? Cuz to buy their whole micro bloom setup, as the calculator says, it costs somewhere around $700. That seems pretty pricey.