2 two main electric impulse with different clock frequencies provided by preliminary ionization of gaseous medium by electrical discharge I and II, methods for treatment of water or aqueous solution of the complex impulse gas discharge plasma derived and maintained on the surface of the liquid flow to be treated. Discharge I is generated by the anode and / or cathode of the impulse frequency 10 Hz to 5 kHz, impulse duty cycle from 1% to 99%, the average current intensity operating voltage of 350 V or less, and 12A to 2000 V, discharge II is a positive electrode and / or 5 kHz frequency of the negative impulse to 80 kHz, impulse duty cycle from 1% to 99%, the average current intensity 10A or less, and the operating voltage 350 is generated from V to 2000 V, of impulse packets at the intervals between impulses of discharge I is created in the form. Preliminary ionization is provided by preliminary ionization impulse and barrier electric discharges, or one preliminary ionization impulse discharge and one barrier electric discharge. A reaction chamber in which the outlet unit for providing a vacuum condition in the inlet and outlet and the gaseous medium for the supply and discharge of the liquid to be treated, in a separate galvanic electrode "A" 27 and the electrode "B" 32 and connected with these is composed of a power supply. Electrode "A" 27 itself is of pipe shape, and the inner side wall is a side wall of the reaction chamber 1, is arranged with the electrode having the opposite polarity to generate a flow of liquid to be processed and generation of the composite impulse gas discharge.electrode "B" 32 is designed in the form of a cylinder or barrel type, and in the reaction chamber 1 and the electrode "A" 27 is fixed coaxially to the electrodes "B" for the electrode "A" are arranged in the electrode having the opposite polarity to produce a composite impulse gas discharge and preliminary ionization impulse discharge. The proposed device is disposed above the reac
