Hydro A & B is a highly concentrated bio-based mineral nutrition, to be used in the growing and flowering phase of the plant. It can be used on all types of inert substrates. It contains easily absorbed nutrients within a broad pH range.
Add up to 1.6 ml Hydro A per 1 litre of water. For any dosage, use the same amount of Hydro A as Hydro B. Use this combined nutrient solution every time you water.