The CDC Biofilm Reactor consists of eight (8) polypropylene coupon holder rods suspended from a UHMW-polyethylene ported lid. Each coupon holder rod can accommodate three (3) 1/2-inch (12.7 mm) diameter coupons, for a total of twenty-four (24) coupons. The lid (with coupon holders and coupons) is mounted in a 1-liter glass vessel with side-arm discharge port. A liquid growth media or biocide is circulated through the vessel while mixing and shear is generated by a magnetic stir bar and vane rotated by a magnetic stir plate.The CDC Biofilm Reactor is completely autoclavable and reuseable. The total liquid volume is approximately 350 ml. More than forty (40) coupon materials are available, including plastics, metals, and ceramics.