An apparatus for sterilising material comprising a first pressure vessel, in which the pressure vessel has a vessel infeed and a vessel outlet. The vessel infeed and vessel outlet are adapted to form respective seals with the pressure vessel such that a desired pressure can be maintained in the pressure vessel, and wherein pressure vessel is depressurised such that the material deposited in the pressure vessel is sterilised and at least a portion of the inner surfaces of the pressure vessel are sterilised, such that the material deposited into the pressure vessel can be stored therein for a predetermined period.
