Mills Basis A&B (1L) is a 2-part nutrient solution with a focus on bioavailability, designed to provide plants with everything they need in thrive in both the vegetative and bloom stage. Made from high-grade components. Precisely balanced to provide maximum nutrition.Suitable for all substrates including soil, coco and hydro! Used by growers of all levels worldwide! Apply A formula first, followed by B. 2 x 1L bottles.