an electrolytic oxidant generator including an anode and cathode within different chambers separated by an ion permeable membrane , and a mixer for circulating saline solution within the anode chamber to enhance dispersal of salt in the solution and maintain the saline solution at high density throughout that chamber . the generator preferably includes an outer shell and a tubular member extending generally vertically within the shell and separating the anode and cathode chambers , with the side wall having a curving portion containing at least one aperture curving with the wall , and with the membrane being secured to and curving with the wall and bridging across the aperture . the inner chamber may take the form of a unit which is removable upwardly from the shell and interfits with the shell in locating relation upon downward movement thereinto . the anode and / or cathode can be connected to the side wall of the inner unit and have their lower ends insertible in interfitting relation into locating socket recesses carried by that wall .