Abstract: A method of filling a flask, the flask having a plurality of individual liquid flaskettes, the flaskettes each being provided with at least one opening into an inlet chamber, the chamber being defined by one end of each of the individual flaskettes and an inlet boundary wall, the inlet boundary wall having at least one inlet through which, in use, a liquid media can be introduced into the flask, the flask also having a longitudinal axis parallel to the planes of the individual flaskettes, the method comprising the step of presenting the flask to a liquid media supply nozzle at a predetermined orientation such that liquid flows from the nozzle along the inlet boundary wall until it can pass directly into one or more of the individual flaskettes.