Ultrasonic Separations (UltraSep) has been developed to separate metal hydroxide precipitates from waste streams. Conventional technologies such as membrane filtration can clog easily and gravity settling requires a large footprint. The technology uses an ultrasonic standing wave to move metal hydroxide precipitates laterally into wave nodes. As they agglomerate with other particles, the precipitates rapidly sink to the bottom of the chamber, resulting in a concentrated solution with a clarified solution simultaneously generated at the top of the chamber. These two solutions, the concentrated slurry and the clarified solution (the filtrate), are individually pumped out of the chamber while new feed is pumped into the chamber and treated with the ultrasonic wave in a continuous process.