Tryptone Yeast Extract Agar is recommended for estimation of microbial counts in water. This medium is formulated as described by ISO Committee for the enumeration of viable microorganisms in water under the specification ISO 6222:1988.Tryptone and yeast extract provide nitrogenous compounds, vitamin B complex and other essential growth nutrients. Total colony forming units (CFU) from the water samples to be tested is obtained either by spread plate or by pour plate technique
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