Abstract: A method and apparatus for purifying liquids, and more particularly for further purifying ultra-pure liquids such as ultra-pure water utilizing an electric field. It has been discovered that organic and inorganic particles suspended in ultra-pure water will exhibit a net negative charge. This discovery has led to the novel method and apparatus for removing most of these particles by establishing laminar flow of the liquid, passing the liquid through an electric field transverse to the direction of flow to induce mobility of the particles away from a negative field surface, separating the liquid into zones established according to the relative distance from the negative field surface and utilizing the zone of liquid closest to the negative field surface as the liquid with the least particle contamination and thus of greatest purity. The other zones of liquid farther from the negative field surface may be recycled through the system.