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6) Contaminated air source
• If possible/applicable, change to CO2 gas as a
pressure source.
• Filter all air after it leaves compressor.
• Oil fumes from compressor or kitchen grease
fumes will cause flat beer when pumped into
beer system.
• Always draw fresh air from an outside source to
compressor. Attach hair felt filter to the outside
intake, in addition to filter in line.
7) Defective Thomas valve (in
the keg coupler) or tongue
vents
• Bacteria growth may result from beer backing up
through defective valves and vents in air line. Air
pressure will then carry this into beer barrel.
Check and replace defective vents as necessary,
and thoroughly clean air line.
8) Unrefrigerated food placed on
barrel of cold beer.
• When unrefrigerated products, such as meats,
vegetables, fish or fruits are placed on barrel of
cold beer, the beer becomes warm long before
these products chill down to the cold
temperature. This change in temperature will
cause cloudy beer.
9) Sluggish pressure regulator • Repair or replace the regulator as necessary. A
regulator seat or the regulator diaphragm may
require replacing.
10) Moisture in air system • With the use of an air compressor, it is
imperative to have a moisture trap installed in
the pre-cooler, and drained daily. This is in
addition to an activated charcoal filter, necessary
to purify the air just before it enters the barrel.
• With tank type compressors, drain the tank
weekly.
• Moisture traps should be drained daily.
11) Drafts • Rapid air movement, caused by an air fan or
exhaust blower, drawing air or blowing air across
the area where beer is drawn may cause the
level of foam to fall quickly. Redirect air flow so
that air movement is not running directly across
area where the beer is drawn.
Problem: Off-Tasting Beer
Beer has bitter and unpleasant odor or taste. Sour beer may taste and smell extremely
yeasty or moldy.
Causes Corrections
1) Improper or lack of cleaning • System should be cleaned at least every two
weeks with an approved cleaner
• Coils should be thoroughly cleaned at least once
every week or two.
• Brush and clean faucet.
• Taps, rods, and tap-Seal fitting should all be
scoured, using a detergent, then rinsed clean.
• Direct draw systems must be cleaned the same as
coil systems: 4 feet of direct draw line
accumulates as much per foot as any other
system.
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