It is suitable for NFT (Nutrient Film Technique), expanded clay, perlite and various other inert soilless substrates. Two-part nutrients have been carefully formulated and balanced using advanced ion chemistry ensuring maximum solubility. HYDRO GROWTH nutrients also work well as foliar sprays. These elements are needed to ensure rapid stem and leaf growth and can support the transition into early flowering and are needed to accommodate the plants changing nutrient requirements. Calcium is responsible for maintaining strong cell structure and vigour. During the late growth stage additional calcium ensures a high number of flowers are produced and retained by the plant. A lack of calcium can lead to a large number of flowers aborting before they can transition into the fruiting stage. HY-GEN HYDRO GROWTH is formulated to meet the requirements throughout growth and is designed for use during the first stages of flowering. It should be used in conjunction with HY-GEN HYDRO BLOOM to guarantee an optimal transition. Its important to have a growth specific and flower specific nutrient to achieve outstanding results They really do make a great couple! HY-GEN HYDRO GROWTH and HY-GEN HYDRO BLOOM from start to harvest!