Nutrients found in Grow A and Grow B are balanced, highly bioavailable, and easily absorbed and utilized. Grow A & B contain potassium, magnesium, phosphate, calcium, and other elements all needed to aid in the growth cycle. Magnesium helps to activate many plant enzymes needed for growth. Every element in Grow A & B plays a role in helping to produce the best quality plant and growth rate. Available in 1, 5, 20 Liters also in commercial quantities. Designed to work with all additives. Better than the nutrient you are currently using. Developed for high performance.