When water is drawn from the tank, the filter is not allowed to draw in air and the tank will collapse due to the resulting vacuum.
The distilled water tank is kept at a high temperature of 80ºC, however, due to the sudden drop in the outside temperature, the water vapor in the distilled water tank encounters a hole inside the cartridge filter when it is discharged through the exhaust filter, and the water vapor condenses rapidly due to the low temperature.
This situation causes the pores of the cartridge filter to become clogged with condensate, which prevents the smooth flow of airflow. As the air flow is blocked, the vacuum effect gradually develops.