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.mabelandfoxs.shop/product-category/lie-on-float/