Water-soluble mineral fertilizer 100%. Directly available to plants (bioavailable). The salts used are of the highest quality on the market and of European origin. There are no heavy metals, chloride, or sodium present. The nitrogen source comes from a chemical reaction, Haber-Bosch: basically, nitrogen is taken from the atmosphere and transformed into a water-soluble salt. Phosphorus and potassium are extracted and then treated to be bioavailable to plants. The micronutrients are chelated, directly bioavailable to plants. Water-soluble mineral fertilizers are the most efficient way to feed plants in hydroponic systems. The 5-gram sachet is sufficient for 5 liters of water. The resulting solution, if kept in a dark place at room temperature, can last for weeks. The fertilizer is produced by a leading European company and packaged by us in sachets for domestic use. CE Fertilizer - NPK 15-7-22 - Total Nitrogen (N) 15% - 10% Nitric Nitrogen (N) - 5% Ammoniacal Nitrogen (N) - Water-soluble Copper (Cu) 0.03% - Copper (Cu) chelated with EDTA 0.03% - Water-soluble Iron (Fe) 0.12% - Iron (Fe) chelated with EDTA 0.12% - Water-soluble Manganese (Mn) 0.05% - Phosphorus pentoxide (P2O5) soluble in ammonium citrate 7% - Phosphorus pentoxide (P2O5) 7% - Manganese (Mn) chelated with EDTA 0.05% - Water-soluble Potassium oxide (K2O) 22% - Water-soluble Molybdenum (Mo) 0.005% - Water-soluble Boron (B) 0.03% - Water-soluble Zinc (Zn) 0.01% - Zinc (Zn) chelated with EDTA 0.1% - EDTA chelating agent - pH range ensuring good stability of the chelated fraction 4-9