another diy CO2 question - The Planted Tank Forum
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  • 1 Post By tropicalmackdaddy
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post #1 of 9 (permalink) Old 07-29-2012, 02:45 AM Thread Starter
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another diy CO2 question

How long should a CO2 batch last? I made a batch last week. And the bubbles are starting to slow down. Ill put my rescipe i used.

In a 20 0z vitamin water bottle
1 cup of brown sugar
1 table spone of yeast

It was orgianly about a bubble per second now its like a bubbble every 1.5 secons after a week. How long should it last?

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post #2 of 9 (permalink) Old 07-29-2012, 04:27 AM
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Depends on the recipe, types of sugar, and yeast. I dont think yours will last long though, its in a small container. I do 2 cups sugar in the raw, 1/4 teaspoon bread machine yeast, and half teaspoon bakingpowder. That will last me almost a month in a half, but it produces very little towards the end
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post #3 of 9 (permalink) Old 07-29-2012, 04:30 AM
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20 oz? most people use 2 liters, i suspect 20 oz with that little sugar and that much yeast will probably last you two weeks at the very very most...
you want lots of sugar, less yeast, more water for it to last longer.

i use the same recipe as the above poster, i change it out about once a month or around 1.5 months like above if i'm lazy :P
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post #4 of 9 (permalink) Old 07-29-2012, 04:59 AM
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Go bigger bottle. I use 2l bottle and 2 cups sugar and 1/4 teaspoon of yeast. It last around 3 weeks. The yeast I use is from red star. Like 1.00 for 8 packets
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post #5 of 9 (permalink) Old 07-29-2012, 01:45 PM Thread Starter
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hmmm ill have to find a bigger bottle
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post #6 of 9 (permalink) Old 07-29-2012, 08:15 PM
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I use two 2 liter bottles, with 2 cups of ordinary granulated sugar, 1/2 tsp of yeast and 1/2 tsp of baking soda. My goal is to have each bottle produce well for 2 weeks, so I can change one bottle per week, same day of the week, always at night after the lights go off. I get 1 bubble every 2 seconds from each bottle, or 1 bubble per second from the two of them. I used to use half the yeast, and no baking soda, but got much less CO2 and not nearly a steady production. With your 20 gallon tank, I would use 1 liter bottles, using one cup sugar, 1/4 tsp yeast, 1/4 tsp baking soda, and would change one bottle a week.

In my opinion DIY CO2 is not steady enough in production to ever use with high light, so we don't need really high concentrations of CO2. My tank is a 65 gallon tank, and my plants grow many times faster and healthier with my CO2 system. I wouldn't use that size system on a 20 gallon tank because I think it might end up giving too much CO2 at night, with the lights off, unnecessarily bothering the fish.
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post #7 of 9 (permalink) Old 07-29-2012, 10:45 PM Thread Starter
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i was thinking of doing a double bottle system. do you have issues with the co2 going the wrong way when changing bottles?
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post #8 of 9 (permalink) Old 07-29-2012, 11:39 PM
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DIY CO2 System - How to do it is the thread where I described my system. I have a check valve right at the top of each bottle, another one in the outlet tube from the bubble counter, and one in the little internal filter diffuser I made. Those prevent any back flow anywhere, at least they are doing so now. How long they will last I don't know. When I unscrew one bottle of yeast/sugar there is never any flow back out the tube sticking through the cap. So far I have had no problems at all with this system, but it has only been in use for about 2 months.
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post #9 of 9 (permalink) Old 07-29-2012, 11:54 PM Thread Starter
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ahh thanks for the link. didnt think about check valves :-p
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