What is a CO2 Pot?

What is a CO2 Pot? SeeMoreBuds mentions it as an option in his book at the beginning, then never refers to it again.

I've seen some kind of disposable co2 generating buckets. Don't remember the web site.

captain pothead said:

I've seen some kind of disposable co2 generating buckets. Don't remember the web site.

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Well thanks for the answer.

I thought I would be bombed with answers because it is mentioned in the book "More Buds for Less"" but only once as an option.

I thought it might be a bucket that you put yeast in or something with a slow release cover on it or something.