well ive done some research and found that 1 litre of vinegar and 100 grams of baking soda makes about 1 cubic feet (1ft x 1ft x 1ft) of CO2, and this makes a high concentration in your grow for up to two days. So, you can do a volcano once every two days and this will be enough to boost your plants growth in say a closet, but if your closet isnt completly sealed you might get away with doing it at sooner intervals.... wow that was fucked i need to find my bong hope i helped