HOMEBREW Digest #5762 Wed 17 November 2010

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  Re: PBW stains (Fred L Johnson)
  Re:Stains on Carboy (Pete Calinski)
  RE: PBW (David Towson)

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---------------------------------------------------------------------- Date: Wed, 17 Nov 2010 07:22:28 -0500 From: Fred L Johnson <FLJohnson52 at nc.rr.com> Subject: Re: PBW stains The (inside) wall of Bill Erskine's carboy that had been filled with PBW for many months, or perhaps years, has something on it that doesn't come off with scrubbing. I suspect the alkalinity of PBW has etched the glass. Of course, there's nothing harmful that can come to the beer or wine from such damage to the glass, but the carboy may now be difficult (nearly impossible?) to clean if it is ever used again as a fermentation vessel. In case it is a calcium deposit, you might try soaking in a dilute acid or EDTA. Fred L Johnson Apex, North Carolina, USA Return to table of contents
Date: Wed, 17 Nov 2010 09:16:09 -0500 From: Pete Calinski <petec.100 at gmail.com> Subject: Re:Stains on Carboy I remember this coming up many many years ago. Some knowledgeable person said to use BBs, i.e. those things used in an air gun. Put some (I don't remember how much) in the carboy and keep rotating. I am sure there are other things that could be used. YMMV Pete Return to table of contents
Date: Wed, 17 Nov 2010 19:40:32 -0500 From: David Towson <davidtowson at verizon.net> Subject: RE: PBW Jon - Thanks for your reply to my query. I enjoyed hearing your discussion of sanitizing with Jamil and John on "Brew Strong". My query was prompted by the following posting on the Homebrew Digest. "Date: Tue, 16 Nov 2010 17:27:44 -0500 From: Bill Erskine <werskin at sympatico.ca> Subject: PBW Stains on Carboy Hi all, I've left some PBW in carboys for many months (years) as I never got around to cleaning them. I didn't think there was any risk to this, but now I am realizing that after I clean them with my turbo scrubber, they look clean as a whistle when they are still wet. However, when they dry there is a white haze stuck to the inside of the wall of the carboy. Questions: 1. What is this? 2. Is it dangerous to beer/wine? 3. How do I remove this. PBW is my go to cleaner for tough stains so I am at a loss as to what to use. Thanks to all who have suggestions. Bill Erskine London, Ontario, Canada" At 11:35 AM 11/17/2010, you wrote: >David, > >I don't believe that the pbw can etch the glass. It may precipitate >out of solution and put carbonates or silicates onto the >glass. However, storing tap water in glass for a year will do the same thing. > >What exactly is going on? > >Jon > >-----Original Message----- >From: David Towson [mailto:davidtowson at verizon.net] >Sent: Wednesday, November 17, 2010 5:58 AM >To: Jon Herskovits >Cc: David Towson >Subject: PBW > >Will a solution of PBW etch glass if left in contact for many months >(like a year)? Return to table of contents
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