Hydroponic fertilisers immediately provide all the necessary nutrients in the correct concentration to the irrigation water so that the nutrients can be absorbed immediately and sufficiently "when passing" along the roots.
HESI Hydro fertiliser is available in a growth and bloom version. HESI Hydro contains complex-binding substances ("Chelate") that keep the trace elements stable and make them tolerant to the nutritional components. Because of this they remain stable until they are absorbed by the plant. Furthermore, the complex-binding substances ("Chelate") make the trace elements independent of the pH-value, so that these remain available at every pH-level.