DIY CO2 - Why 2 liter bottles? - The Planted Tank Forum
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post #1 of 26 (permalink) Old 11-03-2009, 05:04 AM Thread Starter
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DIY CO2 - Why 2 liter bottles?

Getting ready to rig up a DIY CO2 set-up. I don't have a 2 liter pop bottle on hand, so I started looking at an empty 1 gallon plastic milk jug. But, in all I've read about DIY CO2, 2 liter bottles are the norm - so I started wondering why?

Is 2 liters, just the right amount for an optimal CO2 set-up? Or is it something else.

After reading more, I have the feeling, that it has something to do with the construction of 2 liter plastic pop bottles. That they are stronger than something like a plastic milk jug.

So, my question:

Why 2 liter bottles?
Can I use a one gallon plastic milk jug?
If so, do I double the recipe?

Thanks....


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post #2 of 26 (permalink) Old 11-03-2009, 06:14 AM
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Soda bottles are designed to handle some pressure. Milk jugs might be air tight, but have you ever seen a jug of milk pressurized? Its just not what it was designed to do.

Now, having said that, any plastic or maybe even glass container will work for making co2...but the point is to go about it the safest way possible. If for example you would get a clog somewhere, and pressure would start to build up in your container, it is believed that a soda bottle would handle the pressure build up the best. The question is how much do you want to risk your sugar and yeast mixture splattered all over your cabinet.

Another point i can think of is that soda bottles are meant to hold some liquids and CO2, exactly what you will be making. So you can have some confidence that the CO2 will not react with the plastic of the soda bottle or the cap in any way.

Lastly...about the recipe, if you double the size of the bottle, double the rest of the ingredients as well. Just remember that a bigger bottle will give you more co2 but it will not make it last longer.
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post #3 of 26 (permalink) Old 11-03-2009, 06:55 AM
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You will pop the top off of milk jugs. Soda bottles are designed to withstand the pressure as previously mentioned. Gatorade bottles have also been used and I used a 1 gallon apple juice bottle.

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post #4 of 26 (permalink) Old 11-03-2009, 12:40 PM
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x2 on the Gatorade bottles. I swapped out all my 2L bottles in favor of the OceanSpray bottles and using small Gatorade bottles as my seperator. They seal a lot tighter and are less prone to leak through the threads.
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post #5 of 26 (permalink) Old 11-03-2009, 01:45 PM Thread Starter
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Quote:
Originally Posted by james0816 View Post
using small Gatorade bottles as my seperator.
What is a seperator?


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post #6 of 26 (permalink) Old 11-03-2009, 03:41 PM
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i also use 2 1gal ocean spray bottles because the strong and have handles.
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post #7 of 26 (permalink) Old 11-03-2009, 08:25 PM Thread Starter
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Quote:
Originally Posted by Twimbo View Post
What is a seperator?
I will answer my own question. I found a great thread in this forum that explains what a separator is, in a DIY CO2 system. Basically, its a chamber with air (or CO2), between the CO2 reactor and the tank, designed to catch any yeast that might get into the tubing, before it reaches the tank. These separators, can also be used as bubble counters.

See this thread for more info.


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post #8 of 26 (permalink) Old 11-03-2009, 10:36 PM
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Quote:
Originally Posted by Twimbo View Post
I will answer my own question. I found a great thread in this forum that explains what a separator is, in a DIY CO2 system. Basically, its a chamber with air (or CO2), between the CO2 reactor and the tank, designed to catch any yeast that might get into the tubing, before it reaches the tank. These separators, can also be used as bubble counters.

See this thread for more info.
Yeppers...not required...but HIGHLY recommended.
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post #9 of 26 (permalink) Old 11-08-2009, 08:51 PM
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I use a 5L mineral water bottle
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post #10 of 26 (permalink) Old 11-10-2009, 10:44 PM
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I use two 2L bottles with a splitter and two of those thingies that keep the water from backing up (I forgot the name) I heard once of tops blowing off of Gatorade bottles and water bottles. Actually one of my bottles is a Hagen Plant gro. I wish I could find a used one cheap somewhere.

Anyway, I use two bottles an alternate replenishing them every other week to keep the flow more stable.

What tubing connectors do you people use in the soda bottles?
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post #11 of 26 (permalink) Old 11-10-2009, 10:57 PM
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2 liter bottles I think are just easy to find, I use a 3L for my 39gal. I tried to use containers like milk jugs and orange juice bottles but I noticed any jug with one of those soft plastic short caps will leak easily and/or blow the top off.

As for connecting i just popped a hole in the top and siliconed the tubing into it then into the separator and use a plastic flow valve after that just incase.

Incidentally, why was it that none of all the pious ever discovered psycho-analysis? Why did it have to wait for a completely godless Jew?
-Sigmund Freud

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post #12 of 26 (permalink) Old 11-11-2009, 12:34 AM
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i use a water bottle
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post #13 of 26 (permalink) Old 11-19-2009, 12:45 PM
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anyone got pics?
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post #14 of 26 (permalink) Old 11-20-2009, 04:39 PM
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I have been using a 3l soda bottle that is 3 months old and not even half way empty yet. Still going strong at a good 1 bubble every 3-5 seconds.

I mix 4 boxes of Jello with 4 cups of sugar (cooked as per the directions on the box of jello). Pour them in and let it congeal overnight in the fridge. I then mix 1 teaspoon of yeast with 1 cup of warm water and a pinch of baking soda (I think it is baking soda) and pour that on top of the jello mix. I then seal it up tight with silicone or rtv. It produces good pressure after about 2 hours and will last at least 4-6 months.
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post #15 of 26 (permalink) Old 11-20-2009, 04:53 PM Thread Starter
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Jello

I just found this thread, which goes into more detail on the Jello method.

https://www.plantedtank.net/forums/di...html#post85288


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