Liquid supply system

A liquid supply system that supplies liquid, using pressurized gas, from a storage container to a dispensing device through a supply tube and dispenses the liquid from a liquid outlet of the dispensing device into a drinking vessel, the liquid supply system comprising:

• a blowout prevention device that is installed in the supply tube, the blowout prevention device including
• a liquid inlet connected to the supply tube,
• a liquid outlet connected to the supply tube, and
• a float configured to fit in and close the liquid outlet by an inflow of gas from the liquid inlet and thereby prevent the pressurized gas from blowing out from the liquid outlet,
• the blowout prevention device providing information indicative of that a cleaning of an inside of a pipe in the liquid supply system has been done;
• a liquid absence detection device that is installed between the storage container and the blowout prevention device or in the blowout prevention device, the liquid absence detection device including a no-liquid/liquid passage sensor that detects that liquid in the storage container has run out and sends storage container empty information;
• and
• a transmission device that is electrically connected to the liquid absence detection device, and includes a control unit that performs control of information transmission to a communication line,
• wherein the liquid absence detection device includes a nullification device that nullifies the storage container empty information generated when the cleaning of the inside of the pipe in the liquid supply system is done.