My DIY CO2 it's not producing bubbles. - The Planted Tank Forum
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post #1 of 33 (permalink) Old 05-02-2013, 02:17 AM Thread Starter
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My DIY CO2 it's not producing bubbles.

Simple setup I thought. Two generators, tubes into the middle bottle, their tubes get about an inch into the water (wanted to count bubbles), middle bottle runs up to the tank, through a check valve.

Each bottle had a cup of sugar, and 1/8tsp yeast.

Been waiting for four hours with nothing happening.

The tubing fit VERY snug, needed pliers to get it through the 3/16" holes, but it's not pinched shut, so I don't think there are leaks.

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post #2 of 33 (permalink) Old 05-02-2013, 02:22 AM
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It may take up to 12 hours to start producing bubbles. The more yeast you put in the faster it will produce. If by the morning you dont see bubbles then you have a leak.

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post #3 of 33 (permalink) Old 05-02-2013, 02:25 AM
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You should be able to see if there are tiny bubbles forming in your mix it might take some time for them to start forming or if you want you could spray the connections with some soppy water to find out if there are any leaks
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post #4 of 33 (permalink) Old 05-02-2013, 02:30 AM Thread Starter
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Re: My DIY CO2 it's not producing bubbles.

Do I have enough mix in the reactors?

What recipe do you all use?

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post #5 of 33 (permalink) Old 05-02-2013, 02:38 AM
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I fill mine up to where the bottle neck starts and add 1/2 teaspoon of yeast..... it produces a lot of bubbles but will only last 7-10. I find its more consistent than if i put less yeast in which produces less bubbles but last 14-20 days. The key is to have a good difffuser, i use the hagen mini underwater filter its perfect for diffusing DIy co2

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Last edited by stevenjohn21; 05-02-2013 at 02:39 AM. Reason: spelling
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post #6 of 33 (permalink) Old 05-02-2013, 03:01 AM
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I use two liter pop bottles with 2 cups sugar ,2Tbs molasses, 1 tsp yeast , it produces allot of bubbles for 4 to six weeks. The less air space you have in the bottles the better I fill to where the bottle starts to curve in or a little higher also I add two drops of cooking oil after mixing the ingredients until completely dissolved
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post #7 of 33 (permalink) Old 05-02-2013, 03:09 AM
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My guess is that right now you're building pressure in all of that air space you have inside the bottles, which may take a while. You can leave it alone and wait it out, or add more water to reduce the airspace.

Also, how hot was the water when you mixed it all together? It needs to be warm enough for the sugar to dissolve completely, but if it's too hot you'll kill the yeast.

I use mason jars for my generators, and currently I'm using 3 cups water, 2/3 cup sugar, 1/2 teaspoon yeast, 1/2 teaspoon baking soda in each jar.
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post #8 of 33 (permalink) Old 05-02-2013, 03:19 AM Thread Starter
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Re: My DIY CO2 it's not producing bubbles.

It was hot from the tap. But not hot-hot.

I may add more water...to all three bottles?

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post #9 of 33 (permalink) Old 05-02-2013, 03:25 AM
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Yeah, just enough to reduce the airspace inside. Don't fill them too much though or they can slobber nasty gun through the line and into the tank. I generally leave 1" of airspace.
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post #10 of 33 (permalink) Old 05-02-2013, 03:27 AM Thread Starter
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Re: My DIY CO2 it's not producing bubbles.

that's why I have the middle bottle, it should help eliminate any gunk traveling to the tank.

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post #11 of 33 (permalink) Old 05-02-2013, 03:31 AM
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Yeah, I like the two outer bottles dumped into the center much better than all three meeting at a tee, that's a good setup if you can get it sorted out and producing properly. I really think the excess airspace is your issue.
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post #12 of 33 (permalink) Old 05-02-2013, 03:44 AM Thread Starter
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Re: My DIY CO2 it's not producing bubbles.

That's been reduced now. We'll see what happens overnight

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post #13 of 33 (permalink) Old 05-02-2013, 04:54 AM
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Did you mix up your yeast in 110-115 degree water prior to adding it to the sugar water bottles?

I also add in a splash of orange juice, a bullion cube, and a multi-viteman. This is supposed to help the yeast live longer as the alcohol % increases.

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post #14 of 33 (permalink) Old 05-02-2013, 05:37 AM
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a quick search on web: Anything above 120 F the yeast starts dying, and at 140 F all the yeast is surely dead.
depends on yeast, and warm tap water can reach 120F+ easily

its like protein/ enzyme, when it reach certain temperature, it denature and no longer function; think about egg white, once its "cooked", the structure changed permanently and cannot be reversed
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post #15 of 33 (permalink) Old 05-02-2013, 12:42 PM
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Quote:
Originally Posted by kseanm247 View Post
Did you mix up your yeast in 110-115 degree water prior to adding it to the sugar water bottles?

I also add in a splash of orange juice, a bullion cube, and a multi-viteman. This is supposed to help the yeast live longer as the alcohol % increases.
excellent point about the water temp - yeast will not be happy in that range. I always get my wort down to 80F before pitching the yeast when I brew.

Also, I'll offer my opinion as a brewer that the multivitamin is a waste. Each strain of yeast has its own tolerance to alcohol. I don't think a multivitamin is going to change that.

While I'm at it, I'll throw out there that a lager yeast seems to be the best choice for our aquarium DIY co2 purposes. It's slower fermenting than most, will give a longer and more steady co2 output.
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