What kind of wall-mounted toilet water tank saves water?

Oget's hidden water tank is equipped with a patented water-saving inlet valve. Through the delayed water filling mode, water injection can only be started after the drain valve is closed, which can reduce the water consumption and avoid the waste of water resources caused by water injection when the drain valve is opened. According to the calculation, the hidden water tank equipped with water inlet valve can save water by 0.5L per flush, and the average daily water saving can reach 9L.