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 ------------------ 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 ================================= 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.