The Aircos is a non-electric water-saving toilet powered by air potential. This revolutionary concept of adapting an air potential pressure tank allows the toilet to get rid of the traditional water tank. The pressure tank is placed under the toilet to save even more space in the bathroom and reduce transportation costs. This unique design makes the Aircos the world’s shortest water tank toilet (less than 630 mm). The flushing energy is accumulated through the compression from the incoming water. It can achieve a strong cleaning effect by using ultra-small amounts of water (less than three liters) and even in low-water-pressure areas it can achieve a good flush performance.