An upright reactor body with a perforated interior tube member which extends for the length of the reactor body. A water inlet permits water to be treated into the perforated tube member. A fibrous metal anode surrounds the perforated tube member followed by a surrounding layer of dielectric and then a surrounding metal cathode layer, wherein water from the inlet passes radially through the perforations in the tube member, through the anode, dielectric and cathode members, emerging from the reactor body through an outlet. A DC voltage is imposed on the cathode and anode.