From the HBD Archive
From: "1107-CD&I/VIRUS DISEASES" <henchal@wrair.ARPA>
Subject: brewing kettles, water pH, carboys
Date: 1989-02-25 15:25:00 GMT

1. After I mentioned using a 30 qt brew kettle in my last
communication, I had several inquiries where I purchased this
item.

Boiling kettle (ceramic on steel), 33 qt
$27.95 plus shipping

Great Fermentations of Santa Rosa
P.O. Box 428
Fulton, CA 95439
Advice Line 1-707 544-2520
Toll Free Order Line 1-800-544-1867

Mail orders and major credit cards accepted.

Great Fermentations is owned and operated by the award winning
combination of Byron Burch ( author of Brewing Quality Beers) and
Nancy Vineyard (she must know something about fermentations).

I use this kettle on an electric stove and have stopped burning
my wort as a result. I have also found that the wort is less
likely to boil over and does not require constant stirring as is
true with smaller kettles. It has been reported that hop oils
are more fully extracted with full wort boils, but I can't
confirm this. However, if you make the committment to full wort
boils you must also use a wort chiller otherwise it will take too
long before you can pitch your yeast.

2. To: Jeff Miller.

I admire your experiments with pH. It sounds to me that you
have pretty good water in your community judging from the pH
profile that you reported. I agree with you though, that this
experiment might be better performed in the presence of grain.
Any conclusions you make about your water in its absence might
fool you. Grain and other adjuncts will definitely affect the pH
profile of the mash. Extracted components also will have a
slight buffering affect on the pH. The pH will change slightly
as the mash proceeds. My guess is that you will need a small
amount of gypsum and depending upon the adjuncts and grains added
you might have to add 1/4 to 1/2 tsp of citric acid (or sodium
citrate).

With regard to glass carboys. The most common chemicals
shipped in them are industrial acids such as hydrochloric,
sulfuric acids, and nitric acids. Acid residues are easy to wash
out with a large quantity of water. I also recommend that these
carboys be rinsed out with a strong solution of sodium
bicarbonate (common baking powder). Other relatively safe
chemicals found in carboys are acetic acid and acetone. These
chemicals are also easily washed out. However, often mercuric
compounds or benzenes are also shipped in carboys. I would not
use any vessel used for these chemicals which can have long term
health effects. I can recommend the 7 (closer to 7.3 gal) gallon
carboys that Colonel John Canaday sells. Colonel John is an
editor for Zymurgy. He can be reached at 1-303-442-2789 (745 Pine
Street, Bouylder, CO 80302). He will ship carboys anywhere in
the United States for $11 plus shipping. The carboys are shipped
in large space capsule-like styrofoam containers. These syrofoam
shipping containers can then become part of a lauter-tun system.
I feel that I got two great brewing items for $11. Great deal.

ERIK A. HENCHAL, Ph.D.
<WRAIR.ARPA>

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