In 24 hours, Hach's m-ColiBlue24 Broth gives you simultaneous results for total coliforms and E. coli. Use m-ColiBlue24 Broth to accurately monitor and evaluate total coliform and E. coli in drinking water; wastewater; bottled water; beverages; surface, ground, and well water; and ultrapure, chemical processing and pharmaceutical processing waters.With ready-to-use m-ColiBlue24 Broth, you can differentiate colonies easily - red and blue indicate total coliforms and blue specifies E. coli. Get optimal recovery of stressed and injured organisms. Minimize background growth of non-coliform bacteria.m-ColiBlue24 should only be used with pads manufactured by the following companies/brands: Pall Corporation, Sartorius, and Millipore EO.