PURIFIED WATER AND WFI difference

Difference between Purified water and WFI

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Refer to water monographs in Ph.Eur. Purified water is used as feed water for WFI

PW water is prepared from soft water which meets the requirements of USP/IP , have limit of 100cfu/ml.
WFI prepared from fresh pw water which meets the requirements of USP/ IP have limit of 10cfu/ ml.
Used as parental prepation.

microbial limit for WFI is 10 cfu/100 ml