Yeast Generated CO2 System Recipes - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 7 Old 04-25-2013, 08:21 AM Thread Starter
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Yeast Generated CO2 System Recipes

I've read where people are getting 2-3 weeks of well balanced CO2 production out of a bottle. What is the recipe for that kind of result. I'm lucky to get 1 week of reliable production from 2 cups of sugar and 1 teaspoon of yeast.

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post #2 of 7 Old 04-25-2013, 09:20 AM
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theres different types of yeast. Some last longer than others :)
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post #3 of 7 Old 04-25-2013, 06:43 PM
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brewing yeast seems to be the way... never personally used it but that's what I read. diy yeast so much more work and money in the long run anyway
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post #4 of 7 Old 04-26-2013, 06:41 AM Thread Starter
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Thanks, Mitch. I've heard that about the brewers yeast also. Been a little shy about walking into the local beer supply joint only to find out that it costs a lot more than I want to spend. Guess I can find out online before I go.

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post #5 of 7 Old 04-27-2013, 08:00 PM
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i literally just finished recharging the bottles on my two bigger tanks, in which i use two bottles each.

in a two liter soda bottle, or a 1.75 liter juice bottle, i use a recipe of 1.75 cups of regular white sugar, 1/2 teaspoon of bakers yeast, and 1 teaspoon of baking soda.

first i take a cup, and fill it with about a quarter cup of water, add a pinch of sugar, and then add my half teaspoon of yeast. i stir it with a fork, and set a timer for 10 minutes, stirring the yeast every 2-3 minutes. in the meantime, i measure out my sugar and baking soda, and add it to the bottle, then add hot water to fill the bottle about 2/3 full. then i shake it up to dissolve the sugar. after the ten minutes is up, i add the yeast concoction to the bottle as well, and shake for 2-3 seconds, then cap it and it's ready for the tank. in about 2 hours, it should be producing CO2.

the reasoning for adding the baking soda is to prolong the life of the yeast. as the yeast produces CO2, the water in the yeast bottle becomes very acidic, eventually killing the yeast. by adding the baking soda, it kind of counteracts the acidity, and helps keep the water neutral, allowing the yeast to survive longer.

once you do the work to construct your CO2 bottles, with the air hose and caulking, there is very minimal work involved in maintaining it. as long as your bottles are airtight, it should work well for a long time. i run diy CO2 bottles on six different tanks, amounting to a total of 8 bottles, and probably do less than an hour per month of work to recharge the bottles with new batches. and for those six tanks, i'd say it costs me less than $10 a month, which would be for the sugar and yeast. to construct my 8 bottles, i originally maybe used $15 dollars worth of supplies.
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Last edited by Rip; 04-27-2013 at 08:19 PM.
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post #6 of 7 Old 05-10-2013, 01:50 PM Thread Starter
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Quote:
Originally Posted by Rip View Post
i literally just finished recharging the bottles on my two bigger tanks, in which i use two bottles each.

in a two liter soda bottle, or a 1.75 liter juice bottle, i use a recipe of 1.75 cups of regular white sugar, 1/2 teaspoon of bakers yeast, and 1 teaspoon of baking soda.

first i take a cup, and fill it with about a quarter cup of water, add a pinch of sugar, and then add my half teaspoon of yeast. i stir it with a fork, and set a timer for 10 minutes, stirring the yeast every 2-3 minutes. in the meantime, i measure out my sugar and baking soda, and add it to the bottle, then add hot water to fill the bottle about 2/3 full. then i shake it up to dissolve the sugar. after the ten minutes is up, i add the yeast concoction to the bottle as well, and shake for 2-3 seconds, then cap it and it's ready for the tank. in about 2 hours, it should be producing CO2.

the reasoning for adding the baking soda is to prolong the life of the yeast. as the yeast produces CO2, the water in the yeast bottle becomes very acidic, eventually killing the yeast. by adding the baking soda, it kind of counteracts the acidity, and helps keep the water neutral, allowing the yeast to survive longer.

once you do the work to construct your CO2 bottles, with the air hose and caulking, there is very minimal work involved in maintaining it. as long as your bottles are airtight, it should work well for a long time. i run diy CO2 bottles on six different tanks, amounting to a total of 8 bottles, and probably do less than an hour per month of work to recharge the bottles with new batches. and for those six tanks, i'd say it costs me less than $10 a month, which would be for the sugar and yeast. to construct my 8 bottles, i originally maybe used $15 dollars worth of supplies.
Your recipe is working amazingly well. Thank you very much.

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post #7 of 7 Old 05-11-2013, 12:11 AM
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hey glad to hear it!

i never mentioned it in my previous post, but this recipe will keep producing CO2 for at least 4 weeks, but will be slightly weaker after the 3rd week or so. i usually try to replace mine every 20-25 days.
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