The 3M Petrifilm Rapid Coliform Count Plate is a ready-made culture medium system which contains Violet Red Bile (VRB) nutrients, a cold-water-soluble gelling agent, a pH indicator to detect acid and a tetrazolium indicator that facilitates colony enumeration.

Petrifilm Rapid Coliform Count Plates are useful for the enumeration of coliform bacteria. Early coliform results may begin