User:KDS4444/Ultra-pure water

what the hell is "ultra-pure" water (also ultra pure, ultrapure)? See this wikipage: http://en.wikipedia.org/wiki/Water_%28properties%29. Also: http://www.vawater.com/

Ultra-pure water is a form of water sometimes used in laboratories, dialysis, pharmaceutical and industrial applications. The words "ultra-pure" in reference to water occur several times here: http://en.wikipedia.org/wiki/Deionized_water. (variations in "ultra-pure", "ultrapure", and "ultra pure" forms of water appear throughout (and should, I think, be addressed)). It appears that ultra-pure water should not be used directly in aquaria: "Since it does not contain impurities such as copper and chlorine, it keeps fish free from diseases, as well as avoiding the build-up of algae on aquarium plants, due to its lack of phosphate and silicate. Deionized water should be re-mineralized before used in aquaria, since it also lacks many macro and micro-nutrients needed by both plants and fish." (from deionized water)

Also: what is "water-for-injections"? (aka "WFI"). It is described here (http://www.genengnews.com/articles/chitem.aspx?aid=1956&chid=3): "Most bioprocessing and formulation operations use water-for-injection (WFI), the highest purity water and the most costly to produce. For cleaning applications, at a minimum, the final rinse water will be WFI. Prerinse and chemical cleaning cycles typically use USP purified water. USP defines purified water as containing <100 colony forming units (CFU)/mL and WFI as <0.1 CFU/mL." This wikipedia page http://en.wikipedia.org/wiki/WFI is not at all helpful... and should be addressed.

More info on WFI: http://www.edstrom.com/Resources.cfm?doc_id=175 It states there that WFI is "Water for Injection (WFI) is water purified by distillation or reverse osmosis." This is a quote from USP, the http://en.wikipedia.org/wiki/United_States_Pharmacopeia, monograph 23 (wtf).

Within the FDA, a monograph is something very specific: monograph It appears that the leading manufacturer of plastic piping for handling ultra-pure water is a company called Harvel (www.harvel.com). Pretty blue PVC...

days later: finally, a web site that defines it:

http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1132333988&openflup&1&4