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You need 4-methylumbelliferyl-β-D-glucuronide  Escherichia coli  broth medium (Mug Agar), This can help you to achieve the desired result within 18 hrs, at 37 degrees celsius incubator.

You will achieve the total coliform for which the blue dark E coli appear in the same place, where by you can easily do your count.

 

use a 0.45 micron , filter paper.