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  1. #1
    Elite Member Knox's Avatar
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    Cheap, Simple CO2 Chamber

    This works wonderfully.

    1. Small container, holes melted with solder gun in lid and right below rim of container:



    2. Larger container, holes around the top of the container for expanding gas to push out O2 (lid not pictured):



    3. Place mice in larger container with lid on. Place Dry Ice in smaller container and put lid on. Run warm water into dry ice container - it will fall through the holes in the lid and begin to spew forth lots of CO2. Quickly place dry ice container into larger container and close lid.



    It doesn't take much dry ice. About the size of a piece of bread will give more than enough. My Kroger sells it for $1.68 a pound. So a piece the size I need is less than a dollar.

    To me, this is much easier than working with CO2 cannisters and regulators and hoses. The only drawback is a trip to Kroger right before each euthanization. However, Kroger is only 10 minutes away, so it isn't a problem for me.

    And I was worried about the dry ice "melting" too quickly. A piece the size of your palm will last quite a while in the open air. An hour or two.






  2. #2
    mld
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    Re: Cheap, Simple CO2 Chamber

    Great chamber, so how long does it take to do its job?
    Great way to save money and much better way to kill your feeders.
    Michele


    Proud to be Canadian

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  3. #3
    Technical Administrator Rich's Avatar
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    Re: Cheap, Simple CO2 Chamber

    I was also wondering about the time frames. I made this a sticky at the top of the feeders section.

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  4. #4
    Elite Member Knox's Avatar
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    Re: Cheap, Simple CO2 Chamber

    The mice are dead within about 30 seconds.

    I do want to add that there is debate about using Dry Ice for CO2 vs Compressed CO2 from a cannister. The debate is concerning the release time of the gas.

    Some argue for a slow, controlled release of CO2 by use of a regulator. In this manner, the mice pass out before actual death. If water is not added to the dry ice, the gas would flow out at a much slower rate and accomplish the same end over a longer time.

    I am not sure where I stand on the debate, and here is the reason why. When a mouse is constricted by a snake, it is certainly stressed. There is no "nice" falling asleep before death. Not only is it being suffocated, but it is suffering cardiac damage from extremely high blood pressure.

    In the end, the mice are dead in under a minute.

    I wonder what the large scale breeders like Rodent Pro use - Flooding of CO2 or slow, controlled release?

    Just want to throw out both sides of the argument and allow you to make your own choice. I am comfortable with this method...

  5. #5
    Technical Administrator Rich's Avatar
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    Re: Cheap, Simple CO2 Chamber

    I think rodent pro doesn't do either. Unless I am mistaken, they flash freeze their rodents. (I could be wrong.)

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  6. #6
    Elite Member Knox's Avatar
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    Re: Cheap, Simple CO2 Chamber

    Quote Originally Posted by Rich View Post
    I think rodent pro doesn't do either. Unless I am mistaken, they flash freeze their rodents. (I could be wrong.)
    Interesting. Thanks, Rich.

  7. #7
    Technical Administrator Rich's Avatar
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    Re: Cheap, Simple CO2 Chamber

    I was wrong, they use Co2. This is from thier FAQ's section:

    We use Carbon dioxide (CO2), as recommended by the American Veterinary Medical Association panel on euthanasia, as the agent to euthanize our feeder animals. CO2 not only ensures a humane, quick and painless death for the animals but also ensures that no harmful residual chemicals remain that may harm the animal ingesting the prey item.
    They flash freeze the rodents individually after they have been euthanized from what I have gathered.

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  8. #8
    Elite Member Knox's Avatar
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    Re: Cheap, Simple CO2 Chamber

    When they say "ensures a quick, painless death", I am understanding that they use large amounts of CO2 instead of a slow release.

    Much like the method I described ;-)

  9. #9
    Administrator Merlin's Avatar
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    Re: Cheap, Simple CO2 Chamber

    In a commercial situation I woud expect that they go with quick!
    Merlin,
    What's Life Without A Little Magic!

  10. #10
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    Re: Cheap, Simple CO2 Chamber

    Would just breaking there neck be a quicker, more humane method?

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