Hydroponic fertilizers immediately provide all the necessary nutrients in the right concentration in the irrigation water, so that the nutrients can be absorbed immediately and sufficiently "passing" along the roots. HESI Hydro fertilizer is available in a growth and flowering version. HESI Hydro contains complexing ("chelating") substances that keep the trace elements stable and make them tolerant to nutritional components. For this reason, they remain stable until they are absorbed by the plant. In addition, the complexing ("chelating") substances make the trace elements independent of the pH value, so that they remain available at all pH levels. All HESI nutrients are enriched with vitamins and other vital elements that take care of the plant and improve its growth and flowering, but also promote the development of microorganisms in the growing medium, which is also important especially in hydroponic systems: where a healthy and complete environment is essential; a supply of microorganisms is mandatory because these systems basically do not contain microbes and biological bacteria like soil.