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post #27 of (permalink) Old 11-14-2012, 01:29 AM
Planted Tank Guru
Join Date: Dec 2005
Location: Sacramento, CA
Posts: 21,015
Usually when you see no CO2 production you have a CO2 leak, which could be at the bottle cap, or anywhere beyond that up to the bubble counter. The seal where the tube enters the bottle cap isn't good for much pressure, so a sticking or backwards check valve makes it leak there, or a sintered glass diffuser may take too much pressure to get gas flow through it, causing a back pressure and leak.

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