IDEXX - Colilert-18 - For Detecting Total Coliform and E. coli in Water (ISO)
Colilert-18/Quanti-Tray is the ISO standard 9308-2:2012 for detecting total coliform and E. coli in water.
It is US-EPA approved and included in Standard Methods for Examination of Water and Wastewater.
The enhanced formulation of Colilert-18 provides E. coli and Coliform testing results in just 18 hours – 6 hours sooner than Colilert. This shorter incubation period allows laboratories to improve workflow by reading afternoon samples the next morning
Simultaneously detects both total coliforms and Escherichia coli in water, or fecal coliforms in wastewater, giving you results in 18 hours.
- Read afternoon samples the next morning—before the next day’s samples arrive.
- Lift boil water alerts in 18 hours.
- Provide results in record time for real estate, new well, and new construction samples.
- Read Friday samples early Saturday, leaving the rest of the weekend free.
Product Information
Product Number: 98-08877-00
Catalog Number: WP200I-18
Optional
Colilert and Colilert-18 Presence/Absence Comparator
(Cat. No. WP104)
Colilert and Colilert-18 Quanti-Tray/2000 Comparator (97-well tray)
(Cat. No. WQT2KC)
(Cat. No. WQC-TCEC)
Procedure for Qualitative testing (Presence/Absence)
Step 1
Add reagent to sample and incubate at 35°C ± 0.5°C for 18 hours.
Step 2
Read results:
Colorless = negative
Yellow = total coliforms
Yellow/fluorescent = E. coli
Procedure for Quantitative testing (MPN/100mL)
Step 1
Add reagent to sample.
Step 3
Seal in Quanti-Tray Sealer and place in 35°C ± 0.5°C incubator for 18 hours (in other countries, the temperature requirement may be different per regulatory requirements).
Step 4: QuantiTray/2000
Quanti-Tray/2000—Read results:
- Yellow wells = total coliforms
- Yellow/fluorescent wells = E. coli
- Count positive wells and refer to MPN table
