Westbrook, Maine-based IDEXX’s Colilert®-18/Quanti-Tray® test method is approved for compliance testing in the United States, Italy, Germany, Hungary, Iceland, Ireland and Norway, and accepted for compliance testing in the United Kingdom by the DWI. The method detects and enumerates total coliforms and E. coli simultaneously. The fastest approved test in the United States, it produces completed results in 18 hours. Results allow samples processed in the afternoon to be read the next morning.