The Planted Tank Forum - View Single Post - How many of you use the DIY jello co2 model?
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post #6 of (permalink) Old 09-10-2008, 03:23 PM
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The gelatin controls access to the sugar. The yeast must eat and liquify the gelatin to get to more sugar.

I've done both ways, it does last longer in gelatin, and does have lower output - but more steady output, too. No starting like gangbusters and petering out steadily over a week, it goes steady for a couple weeks instead.
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