This research designed and developed an ultrasonic reactor for a fast and on demand production of cold brew coffee. remarkably reducing the brewing time from 24 h to less than 3 min. The technology was engineered by utilizing resonance to induce ultrasonic waves around the walls of the brewing basket of an espresso machine. The sound transmission system comprised a transducer. https://www.bekindtopets.com/great-pick-Obsidian-ULU-w-Eagle-clearance/