You should be able to puchase a regulator at most hardware stores, any place that would sell welding stuff like a home depot. I currently use the sugar/yeast mixture to generate co2. I use 2 1 gallon containers for my room, about 250 cubic feet of space, not sure what the ppm increase is but I feel even a little boost would help. I've been looking for someone with a co2 meter so I can try an experiment. According to my research, ozone when passed through a carbon filter should generate co2 and o2. I just don't know at what concentrations. I have a homemade ozone gen., I just need a way to measure the co2 level. I started a thread on it but noone knowledgeable on the subject posted.