DIY CO2 Mixture - cups? - The Planted Tank Forum
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post #1 of 18 (permalink) Old 06-06-2011, 06:55 PM Thread Starter
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DIY CO2 Mixture - cups?

Hi, im not certain about your measurements for the yeast+sugar mixture.

I read, 1/4 t/spoon yeast, and 2 cups of sugar (some say 1 cup). But, what is this cup measurement? how big is the cup?

My apologies for being a noob. Thank you.
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post #2 of 18 (permalink) Old 06-06-2011, 07:31 PM
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No need to apologize for not knowing something . 1 cup is equal to 240 ml or 8 fluid ounces or 1/2 pint or 200 grams (of sugar).

I use that 1/4 tsp yeast and 2 cups of sugar for my 6 gallon tank. It lasts almost 3 weeks. For my larger 20g I use 1/2 tsp and 2 cups, and it lasts just about 2 weeks. So, the more yeast you use the more CO2 you can make but it will eat through the sugar faster.

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post #3 of 18 (permalink) Old 06-06-2011, 07:33 PM
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wow i must be using to much yeast! i use 1 tsp and 2 cups of suger. lol!


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post #4 of 18 (permalink) Old 06-06-2011, 07:37 PM
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Originally Posted by orchidman View Post
wow i must be using to much yeast! i use 1 tsp and 2 cups of suger. lol!
Well it's all based on how much CO2 you want, if you want hi bps, then you can put more yeast but the mixture wont last as long. If you want say 1 bubble per 3 seconds then you can put less yeast and it would last a lot longer since there's more sugar to nom nom on

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post #5 of 18 (permalink) Old 06-06-2011, 07:40 PM
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i see, that makes sense. i change my co2 once a week so i can have a high bps. its almost 2-3 bps


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post #6 of 18 (permalink) Old 06-06-2011, 07:42 PM
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Originally Posted by orchidman View Post
wow i must be using to much yeast! i use 1 tsp and 2 cups of suger. lol!
Oops! Forgot to mention I'm using brewer's yeast. It's called Lalvin K1V-1116 Montpellier . It's a pretty fast fermenting yeast. I haven't had any experience with other yeast's so the 1 tsp might apply for those.

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post #7 of 18 (permalink) Old 06-06-2011, 07:43 PM
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mine is bakers yeast... i used to use 1/2 tsp. so you were correct


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post #8 of 18 (permalink) Old 06-06-2011, 07:45 PM
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Just because it doesn't make a lot of sense for you to be familiar with the teaspoon measurement and not the cup, a teaspoon is not just a spoon used for stirring tea. It's 5 mL. Imperial units are crazy.
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post #9 of 18 (permalink) Old 06-07-2011, 06:05 AM Thread Starter
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Just because it doesn't make a lot of sense for you to be familiar with the teaspoon measurement and not the cup, a teaspoon is not just a spoon used for stirring tea. It's 5 mL. Imperial units are crazy.
Quote:
Originally Posted by BlueJack
1 cup is equal to 240 ml or 8 fluid ounces or 1/2 pint or 200 grams (of sugar).

BlueJack & Jason, Thank you very much for this explanation. Yep, I did thought 1 teaspoon is the measure of the spoon that I use to make tea/coffee!

EXCELLENT! Will be making the mixture for my 10G today..! Cheers all!
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post #10 of 18 (permalink) Old 06-07-2011, 09:06 AM Thread Starter
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Hm..... Ok i made the mixture but so far nothing happens?

I activated the yeast already with warm water. I have checkvalves and as diffuser I use a piece of coral. I tried to blow it before, and it is able to produce quite fine size of bubbles.. (like 2mm diameter or so)..

What am I suppose to expect in the co2 bottle? I don't see any foam at all and it has been 20 minutes.
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post #11 of 18 (permalink) Old 06-07-2011, 09:30 AM
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It's going to take several hours to get going and won't hit max until the next day or so. Go to sleep and in the morning it should be going.

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post #12 of 18 (permalink) Old 06-07-2011, 09:52 AM Thread Starter
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It's going to take several hours to get going and won't hit max until the next day or so. Go to sleep and in the morning it should be going.
Hi thanks.... I was worried that my baker yeast might be a dud. Will wait till tomorrow for some action. Cheers
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post #13 of 18 (permalink) Old 06-07-2011, 01:32 PM
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Did you shake the mix before connecting it? That also helps Jump start it. But if you didn't it will just take longer. Like someone said, should be going by tomorrow


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post #14 of 18 (permalink) Old 06-07-2011, 01:42 PM Thread Starter
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Originally Posted by orchidman View Post
Did you shake the mix before connecting it? That also helps Jump start it. But if you didn't it will just take longer. Like someone said, should be going by tomorrow


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Hi, actually, I really suspect the yeast could be a dud. It is in fact quite old dried yeast (about 1.5years ago i opened it, but i closed it back and have not used it ever since).

Just now I made a smaller test, of higher ratio of yeast to sugar water. but still no foam or whatsoever even after 1 hour +. This is a sign of dead yeast right?

So Im getting a new dried yeast tomorrow.

I am however thinking to reuse the sugar water (with dead yeast inside).. its such a waste to throw it..
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post #15 of 18 (permalink) Old 06-07-2011, 07:13 PM
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Did you use hot water? If it's too hot it will kill the yeast.

Ya, use that same water for the new yeast. It has nutrients in it from the dead yeast. I've heard of people heating then freezing then re-heating yeast (basically exploding it) to provide a nutrient base for the new yeast to eat. Yeast needs more than just sugar to really excel, that's why professional brewers add yeast nutrients to the fermentation. All that extra work just adds to the life of the yeast. Personally, I'm too lazy and just add sugar.

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