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That's what I meant by "carbon"... in its many forms. :-)
Someone else mentioned pulverized coal -- that sounds like
a filter material.
At 11/4/2009 04:06 PM Wednesday, you wrote:
And to a lesser degree anthracite coal, finely grounds and screed ed, was also used a filtration for water.
From: Tim O'Connor <firstname.lastname@example.org>
Sent: Wed, Nov 4, 2009 12:57 pm
Subject: Re: [STMFC] 1947-era Covered Hopper Question
Yes, but brewers use mineral materials for filtering -- for
example, carbon, or diatomaceous earth. I doubt those hoppers
were used for rice, barley malt or hops.