Simultaneously detects both total coliforms and Escherichia coli; positive results have a distinct magenta color. Results valid through 48 hours. •Distinct magenta color means there's no mistaking a positive result. •Colisure also suppresses high levels of noncoliforms, including Aeromonas. •Colisure is U.S. EPA-approved and included in Standard Methods for Examination of Water and Wastewater.