NOVELTY - Method for membrane (32) cleaning comprises operating device (19) for performing electro-membrane process; and applying inverse electrical pulses to device, where applying inverse electrical pulses comprises providing periodic high frequency alternating or fluctuating current and/or voltage of (1 kHz-1 MHz).    USE - In device useful for performing electro-membrane processes to cleaning of membranes e.g. in electro-dialysis (ED), reverse electro- dialysis (RED), membrane capacitive de-ionisation (CDI) and microbial fuel cells (MFC).    ADVANTAGE - By applying inverse electrical pulses the undesired layers decrease in size or can even be removed entirely, thus obtaining clean membrane surface and improving overall efficiency of electro-membrane processes. The increase of voltage the migration of ions increases in this over-limiting region. This over-limiting region shows improved mixing of diffusion layer due to provision of electro-osmotic instabilities by inverse electrical pulses, thus improves cleaning of membranes in electro-membrane processes. By providing high frequency alternating or fluctuating current to device can improves mixing and extracts particles from the membrane. The inverse electrical pulse lowers overall resistance against mass transport, thus breaking (removing) electrical double layer and diffusion boundary layer on membrane surface during RED process for certain period of time. By breaking these layers the process efficiency and mass transfer increases.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the device for performing electro-membrane process comprising number of anode (34) and cathode (36) compartments provided with number of electrodes; number of cation (44) and anion (42) exchange membranes placed alternately between compartments (20, 22, 24, 26, 28, 30); and function generator unit to provide inverse electrical pulses.    DESCRIPTION OF DRAWING(S) - The figure shows experimental illustrations of device.    Device (19)    Compartments (20, 22, 24, 26, 28, 30)    Membrane (32)    Anode (34)    Cathode (36)    Cation exchange membrane (44)    Anion exchange membrane (42)    Voltage measuring apparatus (46)    Solution (48)    Sea water (50)