A method for exposing a medium that can be pumped to an electric field. The method comprises the operations of: at least one non-conductive chamber (102), which is equipped with a first (106) and a second (108) electrode plates and consisting of a piston pump (116) with a piston (118), whose upper part is one of the electrode plates (106), in which the piston pump (116) is connected to an inlet feed tube and an outlet feed tube, is filled with the medium that can be pumped, in which the medium is subjected to a pressure； An electrical voltage is generated in at least two power supplies (100), in which each power supply (100) comprises a voltage converter (T), a load storage element (C), and a switch (S1 )； a control means (104) for controlling at least said two power supplies (100) by synchronized control of each of the power supply switches (S1) (100) with a common control signal, generated by the means of control (104) in the form of a pulse with a duration of 0.1-100 microseconds, establishes a serial connection between at least two of said two current supplies (100) at least, the first electrode plate (106) and the second electrode plate (108), in which a resulting composite voltage appears between the first (106) and the second (108) electrode plate, whose resulting composite voltage results in an electric field between the first (106) and the second (108) electrode plate, in which the control means (104) detect fault conditions in each power supply (100) before and / or while the connection is established, in which the field strength of the electric field between the first (106) and the se gunda (108) electrode plate is of the order of 1-30 kV / cm, each power supply (100) provides an adjustable voltage of the order of 230-2000 V, and the control means (104) is arranged to repeat the pulse with a frequency of 1 Hz - 100 kHz, and in which the medium that can be pumped is exposed to the electric field, and the chamber (102) is emptied of the medium that can be p
