A method of aseptically dispensing a first component fluid and mixing the first component fluid with a second component fluid in a container having at least one opening, the method comprising:
- containing the first component fluid in an aseptically sealed cartridge having a movable member sealed therein,
- removably and replaceably retaining the cartridge in the opening of said container,
- actuating the movable member to dispense the first component fluid into the container, and
- mixing the first component fluid with the second component fluid in the container.