Microorganisms of water and MLT

why we use only 6 microorganisms in MLT or water test

Those are the pathogens generally found in water.

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see question again why only 6

Dear Arjun,
As I understood these pathogens are the representative of their group or family hence these are included, also maintenance of these pathogens is/are easy as compared to others hence only these pathogens are included.

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