Nonmonographed Waters
These waters can also be used in pharmaceutical processing steps & also as a starting material for further purification or testing purposes.
Pharmaceutical Guideline1 min read

Nonmonographed Waters: In addition to the bulk monographed waters described in the article https://www.pharmaceuticalguideline.com/post/waters-used-for-pharmaceutical-manufacturing-and-testing-purposes, non-monographed waters can also be used in pharmaceutical processing steps such as cleaning and synthetic steps, and also as a starting material for further purification or testing purposes. Unless otherwise specified in the compendium, the minimum quality of water is Purified Water.
[NOTE—The information in this the chapter is not an all-inclusive discussion of all non-monographed waters identified in the USP–NF.]

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Related reading
PharmacopoeiaSOURCE WATER CONSIDERATIONS
Source water is the water that enters the facility. a minimum, drinking (potable) water standards as defined by the regulatory.
PharmacopoeiaSTERILE PURIFIED WATER
Sterile Purified Water is Purified Water, packaged and rendered sterile.
PharmacopoeiaDEIONIZED WATER
Deionized Water is produced by an ion-exchange process in which the cations & anions are replaced with H+ & OH− ions by use of ion-exchange
