From the HBD Archive
From: Steve Dempsey <steved@longs.LANCE.ColoState.Edu>
Subject: Re: Aeration with aquarium pumps
Date: 1992-06-23 20:14:52 GMT

Larry Barello writes:

> At the risk of sounding dumb, what is the advantage of such a complicated
> procedure as using aquarium pumps, micron filters and aeration stones? It
> seems like a lot of effort for such small gain over some other Very Simple
> Gadgets.

Depending on how clean your air is, filtering it may certainly be overkill.
It's just one more way to eliminate potential problems.

The simple `holes in the siphon' method of getting more of your wort
exposed to oxygen may not be enough. A cool, high-gravity wort is not
very receptive to O2 absorbtion to begin with. Most homebrewers underpitch
significantly and really need a large amount of dissolved O2 for the
best fermentation possible. For example, I know of a microbrewery that
had problems traced to insufficient aeration (they used filtered air).
and had to move to pure O2 injection for proper yeast respiration.
The brewer calls it Vitamin O.

My subjective experience indicates that lag times can be reduced by
factors of 2-4 when an air stone is used to introduce more oxygen
at pitching time.

We're not talking about much work or expense here, either. Figure
about $6 cheap aquarium pump, $1 air stone, $3 filter, $0.50 tubing.
Sanitize the tubing and air stone in bleach or ethanol. Sounds to
me like a Moderately Simple Gadget.


Steve Dempsey, Engineering Network Services
Colorado State University, Fort Collins, CO 80523 +1 303 491 0630
INET: steved@longs.LANCE.ColoState.Edu, dempsey@handel.CS.ColoState.Edu
UUCP: boulder!ccncsu!longs.LANCE.ColoState.Edu!steved, ...!ncar!handel!dempsey

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