The ProClean Liner Connecting System (LAS) allows the contamination-free discharging of any type of containers. The product intlet and a side hand-access opening are closed towards the environment by a protective liner. For connecting a container, a liner is fixed with a rubber ring and secured. The operator removes the contaminated protective liners and the rubber rings of the previous discharging process by using a liner tube at the hand-access opening. Upon discharging the container, the liner is closed and separated with the effect that both the discharges sack and the connecting system are sealed against the environment. The liner tube enveloping the contaminated protective liners and rubber rings is disposed of. This discharging system is working extremely well for FIBCs with inliner. Thus the ProClean LAS meets highest demands on human- and product safety.