ReadyPlate(TM) 55 agar plates are stackable specially designed plates that helps increase the safety during handling, transport, incubation and comes in a lockable format. ReadyPlate(TM) 55 agar plates come with a diameter of 55 mm and the medium is filled perfectly on the top which allows easy handling (laying of the membrane) on the agar and prevents formation of air bubbles. Chromocult(R) Coliform Agar (CCA) is a selective and differential chromogenic culture medium used for the microbiological analysis of water samples. Within 24 hours this medium enables the simultaneous detection, differentiation and enumeration of E. coli and coliform bacteria in drinking water.