From the HBD Archive
From: (Mike Zentner)
Subject: Re: sterilizing counter-flow chillers
Date: 1992-06-23 14:33:39 GMT

This comes up every so often, but at caveat for those making or
purchasing a counter-flow chiller. Make sure the inside of the
tubing is free of machining oils. Chemical cleaning is not
sufficient in many cases...requiring actual physical scouring
of the inside of the tubing before you bend it into a coil.

If you want to test your tubing for oils, swab a q-tip soaked
in rubbing alcohol around the inside. If it comes out dirty,
you've got a problem....if problem...

Mike Zentner, who has tried to clean oil out by running 20
batches of boiling water, rubbing alcohol, beer, bleach, soap water and
even lysol through an already constructed no avail.

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