The physical water treatment device, in particular in a flexible water inlet (1), comprises at least one pair of electrodes (2) for water galvanization and at least one means for inserting and fixing the electrodes (2). The means for inserting and fixing the electrodes (2) together with the electrodes (2) form an integral body (3), the resulting shape of which is adapted for the insertion into the flexible water inlet (1). The integral body (3) completely blocks the flexible water inlet (1) and is hollow so that the water flowing through the flexible inlet (1) flows through the electrodes (2) of the integral body (3). The electrodes (2) form a flow-through galvanization system in the integral body (3).