System and method for dispensing a mixture of a liquid and an additive and cartridge for use therein

A method of dispensing a liquid, comprising the steps of:

• filling at least one container with the liquid to be dispensed;
• providing at least one exchangeable cartridge filled with an additive;
• arranging the cartridge in a neck of the container;
• opening the cartridge to allow the additive to flow into the container and mix with the liquid;
• and
• dispensing the stored liquid mixed with the additive;
• wherein the cartridge comprises a one-piece hollow body filled with the additive and with a pressurized gas;
• wherein opening the cartridge further includes piercing a wall of the hollow body by means of a piercing member;
• wherein allowing the additive to flow into the container includes forcing the additive through the pierced wall by means of the pressurized gas;
• and
• wherein dispensing the stored liquid mixed with the additive includes actuating a trigger of a trigger actuated pump of a liquid dispensing device connected to the container.