The 3M™ Petrifilm™ Coliform Count Plate is designed to provide a fast, accurate result in 24-48 hours.3M Petrifilm Coliform Count Plates provide a cost effective, convenient and reliable confirmation method for testing equipment, raw materials, food products and the manufacturing environment. 3M Petrifilm Rapid Coliform Count Plates enable you to monitor critical control points more frequently and detect contamination problems earlier.