IDEXX – Colilert-18 – For Detecting Total Coliform and E. coli in Water (ISO)

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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.

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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

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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.

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Catalog Number: WP200I-18[/vc_column_text][/vc_column][vc_column width=”1/2″][vc_empty_space height=”60px”][vc_column_text][/vc_column_text][dt_vc_list]

• Colilert-18 test Procedure

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Quanti-Tray/2000 (WQT-2K)

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Sterile Vessels with Sodium Thiosulfate (WV120SBST-200)

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SealerPlus (WQTSPLUS)

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6-Watt Fluorescent UV Lamp (WEA160F)

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UV Viewing Cabinet (WCM10)

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Colilert and Colilert-18 Presence/Absence Comparator

(Cat. No. WP104)

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Colilert and Colilert-18 Quanti-Tray/2000 Comparator (97-well tray)

(Cat. No. WQT2KC)

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QC Kits

(Cat. No. WQC-TCEC)

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Step 1

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Add reagent to sample and incubate at 35°C ± 0.5°C for 18 hours.

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Step 2

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Read results:
Colorless = negative
Yellow = total coliforms
Yellow/fluorescent = E. coli

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Step 1

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Add reagent to sample.

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Step 2

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Pour into Quanti-Tray/2000 (counts from 1–2,419).

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Step 3

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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).

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Step 4: QuantiTray/2000

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• Yellow wells = total coliforms
• Yellow/fluorescent wells = E. coli
• Count positive wells and refer to MPN table

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or visit IDEXX’s website[/vc_column_text][vc_empty_space height=”10px”][/vc_column][/vc_row]