Hi Sergio
Because you need a sample representative of the water you are going to use, if you analize the water inmediately you are not going to have a good sample and maybe the results can be different.
Regards
Fabiola Echegaray
Enviado desde mi BlackBerry de Movistar

-----Original Message-----
From:         Sergio Avila <[log in to unmask]>
Sender:       The Pharmaceutical Microbiology Forum Email List <[log in to unmask]>
Date:         Tue, 3 May 2011 18:00:35 
To: <[log in to unmask]>
Reply-To:     The Pharmaceutical Microbiology Forum Email List
              <[log in to unmask]>
Subject: [PMFLIST] Volume of Water sampling

Hi to everibody

Somebody knows why should i let water down before take my sample in a WFI system?
My procedure say's that i musst let 20 liters down before i could take my sample?, but i don't know why, could you give me a reason?

Thanks in advance

Sergio Avila

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The PMFList (http://microbiol.org/PMFList_info.htm) is operated from
The Microbiology Network (http://microbiol.org) and supported by
our sponsors (http://microbiol.org/sponsor.htm) as a service to
the scientific community.

Please take a second to visit our sponsors' web sites and say thank you for their support of this service.

Accugenix - http://www.accugenix.com

American Type Culture Collection - http://www.atcc.org

BD Diagnostic Systems - http://www.bd.com/ds/

Biolog - http://www.biolog.com

Biomerieux - http://industry.biomerieux-usa.com

Biotest - http://www.BiotestUSA.com/micro

MicroBioLogics, Inc. - http://www.microbiologics.com

MODA Technology Partners: now a LONZA company http://lonza.com/moda

Pall - http://www.pall.com

NovaTek International - http://www.ntint.com

Rapid Micro Biosystems - http://www.rapidmicrobio.com  (formerly GPS)

Veltek Associates, Inc - http://www.sterile.com

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The nature of this service is to provide a medium for communication.  The specific statements and endorsements of individuals participating in the discussions are not necessarily those of The Microbiology Network, Inc., the PMF, or the sponsors of the list.