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Colilert®-18/Quanti-Tray®
method lets laboratories manage every aspect of water quality
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The U.S. EPA's regulatory focus continues to shift from beyond
drinking-water monitoring to a more holistic approach to improving
quality throughout the water cycle. IDEXX's Colilert-18/Quanti-Tray
method can help testing laboratories by providing easy, rapid and
accurate results for coliforms and E. coli in all types of
water. Colilert-18 and Quanti-Tray are U.S. EPA-approved for testing
drinking water and ambient water, and the method is currently proposed
for wastewater approval.
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With an 18-hour time to result, Colilert-18 is the
fastest EPA-approved method for detecting coliforms and E. coli. An
18-hour result means that samples run in the afternoon can be read
first thing the following morning. This improves the workflow of the lab
because the recording of results, resampling and paperwork are
completed before the next round of afternoon samples arrives. In
addition, samples run on Friday afternoon can be read early Saturday
morning, leaving the rest of the weekend free.
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Colilert-18, when used in Quanti-Tray or Quanti-Tray/2000, gives a
quantitative result for coliforms and E. coli without the
need for any pre-warming steps.
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Colilert-18 can also be used to detect E. coli in marine water.
First dilute the sample by a minimum of 1:10 in sterile water, and
then use Colilert-18 in combination with either Quanti-Tray or
Quanti-Tray/2000 to enumerate E. coli.
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At one large public health laboratory in the western
U.S., the lab manager likes the sensitivity and specificity of
Colilert-18. He has compared multiple methods and in his view,
Colilert-18 is the most accurate method available. "I view my job as
protecting public health. If a water sample has coliforms or E. coli
in it, I want to use the best method possible to find them," he says.
The lab performs tests on drinking water, river-monitoring projects
and wastewater. The lab manager welcomes the regulatory shift to E.
coli as a wastewater indicator, since it will promote testing
consistency throughout the water cycle. "Runoff in one place can
become part of another town's source water. We should be testing for
the same indicators with the same methods," he said.
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IDEXX Launches Quanti-Disc® |
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IDEXX has launched Quanti-Disc®, a groundbreaking new method for
testing Heterotrophic Plate Count (HPC) in water. This extremely easy,
rapid method produces results that correlate with the Pour-Plate
Method using Yeast Extract Agar medium. Used to monitor heterotrophic
bacteria in water, Quanti-Disc is a ready-to-use test designed to
streamline laboratory workflow.
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TECH TIP
The Quanti-Tray Sealer has been improved! Now both of the rubber
inserts used to seal Quanti-Tray and Quanti-Tray/2000 are included
with every purchase of the Quanti-Tray Sealer.
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The Quanti-Disc method eliminates the
need for agar preparation, auto pourers, glassware and autoclaves.
Running a Quanti-Disc device involves just three steps, pipetting,
incubation and reading, taking less than 15 seconds of hands-on time. |
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