Abstract: Contaminants are removed from untreated raw water or discharge water by applying direct current through an array of spaced, alternately charged electrodes positioned within and electrically isolated from a housing to eliminate or minimize clogging of the electrodes with precipitated contaminants. The housing is surrounded with container structure that cooperates with the housing to define an inlet chamber positioned between the source of untreated water and the housing containing the spaced array of electrodes. The container structure further includes an outlet chamber defined between the housing and the container structure for accumulating and draining water treated by the spaced electrode array.