3M™ Petrifilm™ Rapid Coliform Count Plates are designed to provide fast, accurate results in detecting coliform contamination²³‚ ²⁴‚ ²⁵
High coliform contamination can be detected beginning at 4 hours with distinctive yellow zones. Presumptive coliforms may be be recorded at 14 hours. Confirmed results are available at 24 hours²³‚ ²⁴‚²⁵