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post #8 of (permalink) Old 08-14-2003, 11:29 PM
digger
Planted Tank Enthusiast
 
Join Date: Feb 2003
Location: Minneapolis, MN
Posts: 519
An airlock is a glass tube about 3/8" in diameter, formed like a paperclip.
It can hold water, like a trap in plumbing. The gas can escape, but spores and bacteria are stopped by the water in the trap.
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