A process of filling containers includes a passivating the filling equipment immediately prior to filling the containers with an oxidizing composition. Adjacent containers filled with different compositions are oriented relative to each other by marking the containers with a visible indicia representative of a pick up point of a dip tube within the container, rotating the containers relative to each other until the pick up point of each dip tube is positioned is a predetermined relationship to each other and thereafter adhering the containers are to each other in the predetermined relationship.