The process consists in subjecting the solution used as culture medium, containing one or several types of microorganisms, to a number of co-operative fields, in a plant for activating / structuring liquid solutions, and controlling the fields parameters.

The use of a plant for activating – structuring fluid solutions in cooperative fields, with interconnected structuring columns and the possibility to independently control the parameters of electric, magnetic and ultrasonic fields (an improvement of the patent RO 107629), for an optimum stimulating condition, the flow rate being adjusted for a retention time of 1 – 3 min., the electric and the magnetic fields being controlled, resulting in  a stimulation of microorganisms metabolic process.  By increasing the retention time,  the metabolic processes inhibition is achieved.