This would be more for someone with a small operation, who would just have to euthanize a small amount of rodents, or one at a time. It does work, I've been using this method to prekill for the cornsnake. Use a container for your killing mix, and a slightly larger container that can "house" the killing mix container and your rodent(s). Put baking soda in the kill mix container, then place this container into your larger container, add your rodents to the larger container, dump vinegar (white distilled) into the baking soda and close the container and wait. I honestly use sandwich baggies, because I've only been prekilling one at a time, however, I'm sure it would work with other types of containers, as long as you use enough baking soda/vinegar to fill the other chamber with co2.