Space Shuttle Shuttle Waste Collection System (WCS) Odor/Bacteria Filter, measuring 7″ in diameter and 12″ long, with attached JSC Project Parts Tag identifying it as "S/N: 0032, Item No. WCS1134-02, Filter, Odor/Bacteria…Contract NAS9-20000," listing the unit cost as $6057. The unit is sealed in pink plastic. The canister-shaped module contains activated charcoal and a membrane filter designed to cleanse air of odors and bacteria before it is returned to the cabin.