You need to select a base nutrient like Sensi Bloom, Jungle Juice, Connoisseur, or Iguana Juice then you pick out which supplements you are going to use to increase yield and potency... Check out the Advanced Nutrients website they have a nutrient calculator that tells you how much nutrients to use based on your reservoir size... I use Sensi Grow and Bloom with a few organic supplements right now but want to make the switch to 100% organic gardening in the future