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There are several methods to generate C02 / carbon dioxide enrichment for greenhouses and grow rooms. A very basic Carbon Dioxide generator can be easily made with sugar, baking soda and dry active yeast. Other methods include Dry Ice and baking soda/ vinegar.
Producing C02 with dry ice works to a very limited extent by simply allowing dry ice to melt in your grow room, it will boost the c02 levels. I freeze dry foods with dry ice so sometimes use this mode, it is not as reliable as other methods but it sure is cost effective.
The most effective Do it yourself C02 generator involves the use of sugar, baking soda and dry active yeast.
Another method of producing carbon dioxide, without using yeast or producing alcohol is with vinegar and baking soda. Perhaps as a kid you made one of those bubbling vapor sewing volcanoes as a science project. Chances are it was done with vinegar and baking soda. Putting the 2 together induces a chemical reaction that generates C02.
It is short lived but temporarily boosts carbon dioxide / C02 levels. Some growers set up a drip system that allows droplets of vinegar to gradually drip into baking soda, which releases some C02 with each subsequent droplet.
You cannot accurately control CO2 output with any of the DIY generation methods, multiple variables can cause spikes and dips in the carbon dioxide levels so it is advisable that you monitor it closely.