A reactor system, for electroporation includes a reactor chamber having a length and a width, whereby the reactor chamber contains a central section along its length. A first pulse generator to which two electrodes (A1) and (A2) are connected are located in the reactor chamber in the central section of the reactor chamber such that they are, when measured in the length direction of the reactor chamber, at least a distance equalling half the width of the reactor chamber apart. A second pulse generator to which two electrodes (B1) and (B2) are connected are located in the reactor chamber in the central section of the reactor chamber such that they are, when measured in the length direction of the reactor chamber, at least a distance equalling half the width of the reactor chamber apart.
