The Planted Tank Forum - View Single Post - 20 gallon long dirt tank
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Old 01-26-2013, 01:53 PM   #79
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The POM bottle is where the yeast mix goes, producing the CO2 that goes through the tube and into my little homemade bubble counter/nasty yeast mixture catcher. I don't really need it for bubble counting since I can hear the bubbles get chopped up in the filter impeller, but it should stop any alcohol that forms in the tube or top of the POM bottle from making its way to the tank.

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