The invention relates to a device for antibacterially treating, in particular, decontaminating and/or sterilizing water and for killing microorganisms in water. Said device comprises a container, which is configured for accommodating a quantity of water to be treated, and comprises an electrode arrangement, which is configured for acting upon the quantity of water in the container and which can be connected to and operated by an electrical signal generating device provided outside of the container. Said electrical signal generating device can be operated with low voltage and is configured for generating an electrical alternating signal between the electrodes of the electrode arrangement with a maximum amplitude of