Quanti-Tray provides a wider counting range than and comparable accuracy to membrane filtration (MF).

Yes, the trays are gas sterilized using ethylene oxide. A certificate indicating sterility is included with each box.

The shelf life of Quanti-Tray and Quanti-Tray/2000 is up to three years from date of manufacture. When storing opened bags of trays, fold over the opened end of the bag and seal with tape.

No, the short time period that the tray is in the sealer will not harm the bacteria. The temperature in the wells will not increase more than 5°C during sealing.

Empty wells do not affect the test interpretation as long as the entire sample is in the tray. The effect on the Most Probable Number (MPN) table is statistically insignificant. An empty or partially filled well is interpreted the same way as a full well.

Yes. Quanti-Trays can be stacked as high as desired. Use caution not to block the airflow in the incubator.

Use the Quanti-Tray® Comparator (#WQTC) or Quanti-Tray®/2000 Comparator (#WQT2KC) as a reference. Any color or fluorescence equal to or greater than the comparator is considered positive.

Color intensity is a reflection of the different metabolic rates and final concentrations of the coliforms and E. coli in the different wells. Any yellow color or fluorescence in the sample well equal to or greater than the Quanti-Tray or Quanti-Tray/2000 Comparator is considered positive.

To determined the presence of E. coli, wells must be yellow and fluoresce. A fluorescent well, which is not yellow, is not an E. coli positive well.