Abstract: An improved assembly of bipolar electrode elements for use in the electrochemical preparation of hypochlorites or chlorine from dilute water solutions of chlorides, particularly mildly saline swimming pool water, is described. The end of each bipolar electrode element is enclosed in a nonconductive plastic strip, and guard baffles of corresponding thickness and height are inserted on each side of the bipolar electrode. A desired number of these elements are grouped and cemented together by solvent welding. Special adhesives enhance the sealing of the bipolar electrodes. With this electrode assembly, the deposition of mineral deposits on the electrode surfaces can be minimized by reversing the flow of direct current as often as twice a day or as seldom as once every two weeks.

Abstract: Bipolar cells are designed to permit the introduction of full wave, half wave, or time proportioned, rectified and unfiltered current into a special electrolysis zone which contains coated titanium anodes and steel cathodes with nonconducting baffles which protrude beyond each bipolar electrode in water containing dilute salt solutions. Thereby voltage transformers are eliminated and amperages are very much decreased and easily controlled. For the chlorination of swimming pools, all of the filtered pool water is passed directly through the bipolar electrodes at velocities between 3 and 6 feet per second. This direct liquid flow combined with time proportioned electric current and with iron or stainless steel cathodes prevents the accumulation of precipitates in the cell and permits the control of a wide range of chlorine concentrations while prolonging the life of the coated anodes.