Question about nutrients after the last round of flowering nutrients I purchased left a dent in my wallet! Is possible to take the nutrient ratio number, Ex. 20-20-20, and buy any brand of nutrient with the same corresponding number? I figured rather than buying big bud and paying for the name, can I just go buy the "generic" brand for a fraction of the cost? Or does Advanced Nutrients have something proprietary to their brand that would make that idea stupid?