Hydroponic systems liquid nutrient solution. GrowSerum is scientifically formulated and tested to provide the optimal nutrition requirements for plants across their growth cycles. The nutrient solution, GrowSerum, increases the efficiency of your hydroponic commercial system - yielding 48 kg of crops per liter - and ensures consistency across all production cycles all year round.Hydroponic systems liquid nutrient solution. GrowSerum is scientifically formulated and tested to provide the optimal nutrition requirements for plants across their growth cycles. The nutrient solution, GrowSerum, increases the efficiency of your hydroponic commercial system - yielding 48 kg of crops per liter - and ensures consistency across all production cycles all year round.