The Quanti-Tray® Method:
Microbiological quantification made easy

Since IDEXX introduced the Quanti-Tray method in 1994, thousands of laboratories around the world have benefitted from the method's ability to easily, quickly and accurately detect coliforms, E. coli and enterococci.

Now the U.S. EPA has approved IDEXX reagents and the Quanti-Tray method as part of its final Ambient Water Rule. This rule encourages states to use E. coli and enterococci as indicators of fecal contamination in ambient water. Colilert®, Colilert®-18, Enterolert®, Quanti-Tray and Quanti-Tray/2000 are now approved methods for these indicators under The Rule.

The Quanti-Tray method is based on the standard most probable number approach for enumerating bacteria in a sample. But unlike multiple-tube fermentation—also based on this approach—Quanti-Tray is simple and precise.

The Quanti-Tray Sealer automates the procedure, minimizing hands-on time and maximizing throughput (up to four samples per minute). Quanti-Tray's 51 wells provide a high counting range (up to 200/100 mL without dilutions), and very tight 95% confidence limits. Quanti-Tray/2000 features 97 wells and provides counts up to 2,419/100 mL.

See Quanti-Tray for more information or call 1-800-321-0207.

Quanti-Tray Improvements

In the past two years, IDEXX has further improved Quanti-Tray's ease of use:

• New rubber inserts: Rubber inserts for Quanti-Tray and Quanti-Tray/2000 now feature beveled ends to ease tray feeding and 18-mL overflow wells to help eliminate spills into the sealer.

  
  
  

• Preventive maintenance instructions are available for download or can be ordered for free by calling 1-800 321-0207.
  
  

• Free MPN software diskettes perform the automatic calculation of MPN results, as well as 95% confidence limits. These can be ordered by calling 1-800-321-0207.