Mills Nutrients Basis A & B is a high quality, concentrated formulation of mineral and organic nutrients.Suitable for all growing systems and media - soil, coco or hydro. Mills Nutrients Basis A & B is used throughout the plants life cycle, both vegetative and flowering/fruiting. Ensuring a healthy plant, with no sacrifice of flavour or aroma.When used alongside the rest of the Mills Nutrients range, the Basis A & B gives strong results, whether for beginners or more advanced growers.Contains all the macro and micronutrients plants need.Combination of high quality organic & mineral nutrients.Improves nutrient absorption.Stimulates the plants immune system, providing protection against pests.For use during veg & flower.Mills produce Basis A in hard and soft (or R.O.) water formulations - Basis B is universal. If you order Mills Basis A & B Hard Water only the A will specify the water type.Available in 1l, 5l, and 10l sets - this refers to the volume of each part.