The Planted Tank Forum - View Single Post - Does Anyone Use The Nutrafin CO2 system?
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Old 11-21-2012, 05:32 PM   #6
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The basic concept is that yeast will produce CO2 when it eats sugar.
By mixing sugar and water in a sealed bottle with just a little bit of yeast the yeast will grow. With the right tubing the CO2 they produce can be added to the aquarium.

Here is one way to do this.
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