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A Comparison of IDEXX Coliform and E. coli Tests

The Strengths of IDEXX's Coliform and E. coli Tests

Colilert®

Lowest cost and most popular Defined Substrate Technology® (DST®) test

Colilert®-18

Ideal for afternoon and rush samples as well as real estate, new well and new construction samples

Colisure®

Obvious endpoint color

Longest read window (24-48 hours)

Beginning the week of March 19, 2007, all IDEXX Colilert® and Colisure® products will be irradiated. View Frequently Asked Questions on the new process.

A Comparison of IDEXX's Coliform and E. coli Tests

IDEXX's family of coliform and E. coli tests offer you the flexibility of U.S. Environmental Protection Agency (EPA)-approved tests that give you results in 18, 24 or 48 hours. You can also choose between a yellow or magenta positive endpoint. The chart below outlines the features of each of these tests.

Feature	Colilert	Colilert-18	Colisure
Time to Result	24 hours	18 hours	24 hours
Incubation Time	24-28 hours	18-22 hours	24-48 hours
Quantification Options	Quanti-Tray®, Quanti-Tray®/2000 and MPN tubes	Quanti-Tray*, Quanti-Tray/2000 and MPN tubes	Quanti-Tray*, Quanti-Tray/2000 and MPN tubes
Shelf Life	Up to 12 months at 4-30°C	Up to 15 months at 2-25°C	Up to 12 months at 2-25°C
Formats	10 mL predispensed, 50 mL, 100 mL, 250 mL	100 mL	100 mL
Prewarming	No prewarming required	Prewarm P/A samples to 35°C	Prewarm P/A samples to room temperature
Coliform Signal	ONPG turns yellow	ONPG turns yellow	CPRG turns from yellow to magenta
E. coli Signal	MUG turns fluorescent	MUG turns fluorescent	MUG turns fluorescent

* For best results, use IDEXX Antifoam with Colilert-18 and Colisure when using Quanti-Tray.