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The Specimen Chamber Service Unit, a component of the Space Station Centrifuge Facility, must provide a clean enclosure on a continuing basis for the Facility's plant, rodent and primate specimens. In the Centrifuge Facility, animal and plant specimens reside in enclosures called Specimen Chambers which fit inside larger, self-contained Habitat modules. The Specimen Chambers will become soiled and will require periodic servicing to maintain a clean environment for the specimens. Two methods of servicing the Specimen Chambers have thus far been proposed: washing the Chambers with an on-board washer, or disposing of the soiled Chambers and replacing them with clean ones. The choice of servicing method involves a large and complex set of issues.