Flow circuit for carbonated beverage machine

A beverage making machine, comprising:

• a precursor liquid supply to provide precursor liquid used to form a beverage;
• a carbonation tank having an inlet coupled to receive precursor liquid delivered by the precursor liquid supply, and an outlet at a bottom of the carbonation tank to deliver precursor liquid from the tank to a dispense line that leads to a dispensing station;
• and
• a carbonating gas supply line fluidly coupled to the dispense line of the carbonation tank to deliver carbon dioxide gas to the outlet of the carbonation tank to carbonate the precursor liquid;
• wherein delivering carbon dioxide gas to the carbonation tank through the carbonating gas supply line purges the dispense line.