Van Model Soda Machine

How Does It Work? In a soda fountain machine, CO2 is dissolved into water by lowering the temperature of the water or increasing the pressure of the CO2 gas using a carbonator. Booster pumps force the water to increase in pressure, allowing the CO2 to dissolve into the water.A soda fountain is a device that dispenses carbonated soft drinks, called fountain drinks. They can be found in restaurants, concession stands and other locations such as convenience stores.