DIY CO2 Supplementation

Beware that distributors will typically only exchange their own tanks. They won't exchange tanks you bought on Amazon or something.

My experience with CO2 reactors in aquariums have not been very good. It is usually inconsistent and not worth the trouble. The only time I achieved good results were after I got a small tank and diffused it into the water using a regulator and air stone. There is a little bit of an up front investment for the tank and regulator, a 5 or 10 lb tank isn't very expensive. When they are empty you swap them out for a full one, refills are pretty cheap. You can get them from a welding supply store like Airgas or LInde. They need a specific regulator (most Argon and CO2/Argon mixture tanks use a regulator with a male connector, C02 regulators use a female and need a plastic washer that fits inside the fitting. Gas distributors give the washers out for free and usually have a little dish full of them at the counter). Lots of people use CO2 for flux core welding and in beer taps.

For a smallish room and a few months, you need something like 30lbs of sugar to boost into the 1000-1300 range. size of room matters. rate of co2 released from the reaction of yeast and sugar can be used to determine a good guesstimate of PPM added to the space. you know the moles release per time increment then convert to ppm with the space involved. the more tightly sealed the area is th emore accurate the math will be -- also the less often you open it up etc. this is easily calculated with a few google searches. i'll leave that to you. it doesn't have to be an unknown or guess... if you don't want it to be.

I don't typically mess with co2 enrichment. Unless you have extreme control over your lighting, ventilation control, nutrients dialed in, i find it to me a waste of time. The gains are awesome if you have your environment really tailored to utilization of co2, it's kind of a waste of time. The air has enough co2 to achieve a solid harvest. Back in the good old days we messed with co2 propane burners and all they really did was increase the room temp by 10 degrees and create humidity issues which resulted in fungus problems in the garden. I have a BC Northern Lights Bloombox that has co2 injection. It's just a novelty because the exhaust fan in the unit runs constantly. So it dispenses co2 into the chamber and then is flushed out immediately. CO2 need to be injected into your space with the extraction fan OFF, and just your oscillating fan blowing the plants around. The only way i feel it's of benefit to run co2 is if you are controlling the co2 injection with a co2 monitor that is tied in with the heat and humidity extraction fan control. So if you have your intake and exhaust wired tight, and no breeches in your space other than those, which are controlled, then i say yep, co2 is the sheeit, but if you aren't extremely on point with your space, i think it's a waste of time and money.

I think its brilliant. Although I would have it coming out right below the light. As you already know Co2 is heavier then air so it will fall. I would say it would be more effective coming out of the tube above the canopy and a fan blowing it across the canopy. If your only going to fill it to the level in the video, then no way it will overflow. I make moonshine and this is essentially sugar mash. The head that will develop won't come near overflowing. Adding the air stone would potentially produces more co2. But it may deplete it quicker, so watch and add sugar and yeast as necessary. I think it is great and almost identical to what I planned on doing, although yours is larger. I would suggest adding AC/heat so the tent is dialed in and so you won't need air exhaust or intake. Thus making the co2 even more valuable. If your venting then it's fighting to stay in the tent. Other then that wonderful! Great job.