Difference between Purified water and WFI
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