S2Media™ 6x Lauryl Tryptose Broth (LTB-6 or 6xLSB) with Bromocresol Purple is a selective liquid medium ued for the detection of coliforms in materials of sanitary importance. The fermentation of lactose with gas formation, typically collected in an inverted Durham tube, is a presumptive test for coliforms. Bromocresol purple is a pH indicator, causing the solution to shift from purple to yellow when lactose fermentation occurs. The fermentation of lactose with gas formation, typically collected in an inverted Durham tube, is a presumptive test for coliforms. Sodium lauryl sulfate inhibits non-coliform organisms. • Product meets AOAC, APHA, BAM, EPA, and SMWW reference methods and performance criteria.• 6xLSB should be used by trained professionals within a laboratory setting. • Product is not intended for use in the diagnosis or treatment of disease or other human conditions.• Also known was Lauryl Sulfate Tryptose (LST) Broth or Lauryl Sulfate Broth (LSB).