Abstract: The present invention introduces method and apparatus comprising an improved design for the high-pressure electrocoagulative treatment of aqueous and viscous fluids and sludge. The apparatus is configured as a plate and frame design utilizing hydraulic or screw type mechanical closure on a plurality of recessed, gasketed, non-electrically conductive electrocoagulation spacer plates, hereafter referred to as spacer plates, that completely enclose and isolate all fluids, electrical contacts, and electrodes within the confines of the apparatus. The spacer plates include integral supports on their edges that position and support said spacer plates with enclosed electrodes on top of the side rails of the supporting frame of the apparatus allowing said spacer plates to be separated for electrode replacement and maintenance and conversely closed, pressured and put into service.