Tumble stirrers

are stirrers with tumbling (overlay of two circular movements) instead of the common rotating stirrer movement in stirred bioreactors. Pall Life Sciences has included single-use mixing systems and bioreactors in their portfolio, with the PadMixers and the PadReactors consisting of a cubical bag with integrated tumbling stirrers. The design of the stirrer in the form of a paddle allows them to be equipped with additional spargers (see aeration system) ⁷⁴.