Optimum Overview Optimum is a well-established twin pack nutrient. Optimum has been on the market for over thirty years but its formulation has been continually modified and improved in the light of new information and growing experience. Optimum is also available in special HW formulations designed for use with hard water. Optimum is highly recommended for all hydroponic applications. Growth Technology twin-pack nutrient solutions Nutrients formulated specifically for hydroponic cultivation. The formulations are based on long commercial experience but have been extensively revised and refined over the years. Manufactured from the purest and most soluble mineral salts. Complete in every elemental detail and balanced for maximum plant performance. Optimum is available in standard and hard water options – in either case precisely tailored to the water supply. Available in GROW and BLOOM options. These variations are based upon the nutritional requirements of green plants at each stage of the growth cycle. The Grow formulation is designed to maximise potential for vigorous vegetative growth while the Bloom nutrient is loaded with the crucial elements that support heavy flowering.