environmental monitoring

When preparing 3M™ Petrifilm™ for use in your environmental monitoring program there are different hydration methods to follow, depending on the test and the context in which it is used.

For air or direct contact procedures where Aerobic Count, Coliform Count, E.coli/Coliform Count, Rapid Coliform Count or Enterobacteriaceae Count Petrifilm™ are being used, hydrate plates with 1 mL of appropriate sterile diluent. Allow hydrated plates to remain closed for a minimum of 1 hour before use.  If using Staph Express Count Petrifilm™, hydrate plates with 1 mL of appropriate sterile diluent. Refrigerate hydrated plates for a minimum of 3 days before using.

For air testing using either Yeast and Mold Count or Rapid S. aureus Count Petrifilm™, hydrate plates with 1 mL of appropriate sterile diluent. Allow hydrated plates to remain closed for a minimum of 1 hour before use.