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I use this recipe, minus the baking soda.

http://www.aquatic-eden.com/2006/09/diy-co2-recipe-duration-vs-intensity.html?m=1

I run three 64oz juice bottles into a 12oz Gatorade drip/snot bottle, then into the intake of my fluval fx5 on my 125. It's not much, and I just upgraded from one to three bottles about a week or two ago, not enough time to tell a difference yet.

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For 2 liter bottle, I use 2 cups of sugar, 1/2 tsp of bread machine yeast, 1/2 tsp of baking soda. I fill the 2 L bottle up to just past where it necks down towards the cap.
 

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In a 1-liter bottle: half- to two-thirds full with warm water, add 1/2 cup of sugar and 1/2 tsp of yeast. It's just that simple. Lasts about 2 weeks. Start a bottle, then a week later start another, a week after that replace the first bottle, etc.
 

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2 liter bottle I used 2 1/2 cups sugar filled to the brim, 1/4 tsp yeast & one energy pill. Don't ask why i figured it wouldn't hurt to throw something random as i was running two bottles. I got a little over 3 weeks
 
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