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Cheap, Simple CO2 Chamber

Discussion in 'Feeders' started by Knox, Feb 12, 2011.

  1. Knox

    Knox Elite Member

    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.

    Attached Files:

  2. mld

    mld Subscribed User Premium Member

    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.
  3. Rich

    Rich Administrator Staff Member Premium Member

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

    Knox Elite Member

    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. Rich

    Rich Administrator Staff Member Premium Member

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

    Knox Elite Member

    Interesting. Thanks, Rich.
  7. Rich

    Rich Administrator Staff Member Premium Member

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

    They flash freeze the rodents individually after they have been euthanized from what I have gathered.
  8. Knox

    Knox Elite Member

    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. Merlin

    Merlin Administrator Staff Member Premium Member

    In a commercial situation I woud expect that they go with quick!
  10. Hybrid

    Hybrid Well-Known Member

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

    Knox Elite Member

    Yes, but when you have lots of feeders to euthanize, that isn't very efficient.
  12. Swimmer522

    Swimmer522 Elite Member

    What about freezing them? I read that the mosue falls asleep then just dies?
  13. Knox

    Knox Elite Member

    That is generally accepted only with pinks. Once the mouse has fur, it stays alive longer and suffers.
  14. Swimmer522

    Swimmer522 Elite Member

    Oh okay thank you.
  15. Merlin

    Merlin Administrator Staff Member Premium Member

    That is info that is way outdated. It was once beleived that they just fell asleep.
    It has been learned that it is actually a slow painful way for them to die. First their extremities freeze, and then the freezing works its way into the body.
  16. CornyBoa

    CornyBoa Active Member

    Can you euthanize, say 10 mice, use a couple for feeding and freeze the rest for later? Or is there a technique for freezing freshly euthanized mice?
  17. Wyldrose

    Wyldrose Elite Member

    You can gas a bunch, then feed off some right away and freeze the rest. If I only have to feed one or two I don't gas them, I flick them on the backs of their heads, they die instantly. If I had to do that with the 28 rodents I need to feed that would take too much time so I like the gas chamber idea.

    If you add bedding, shredded paper etc. Makes it much easier to clean afterwards.
  18. mayhmmaydn

    mayhmmaydn Elite Member

    so much nice then back in the day when it was a pillow case and a hard surface.... sorry.... but that did work way back too..

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