CO2 definitely has its purposes. It's readily available at welding supply stores so welders can fill tanks and the like so they don't go boom when they start work.
I use it to make soda pop. Out of nearly any beverage. All it takes is a 75 PSI PSIG ( 6 Bar) regulator and soda bottle with a tire stem mounted in the cap.
I already keep liquid CO2 cylinders around to make soda pop. This is like something I keep around just in case...
https://m.aliexpress.com/item/32759620609.html
Yeh, I see it's billed as a DJ fog shooter. My own feeling is that is a thing every diesel mechanic should have just in case of diesel runaway. That fog is mostly CO2, cold, and full of water mist which will suck the heat right out of a runaway engine. And cheap to refill. And most important, not damage the engine. Just put it to sleep until you can figure out where it's getting its fuel.
https://refrigeranthq.com/r-744-carbon-dioxide-refrigerant-fact-info-sheet/
From this : "While it is non-toxic there is still risk if a leak occurs in an enclosed area as R-744 will displace the oxygen in the room and could cause asphyxiation."
And that's exactly what we had in mind. For the engine. Put it to sleep without harming it.
I don't know what that 120 volt power stuff they refer to is. Liquid CO2 will get very cold when vented, and change atmospheric moisture to fog. From what I can tell, this is only a CO2 valve. The tank pressure for liquid CO2 is in the 700 to 1500 psi, depending on ambient temperature... You need a high pressure hose to the jug.
CO2 jugs have standard fittings. The welding supply store knows all about it. Far more than I.
It costs me about $20 to get my jug refilled.
20 pound jug. That's 20 pounds of liquid CO2. They sell it by the pound, not the gallon.
The jugs look like a scuba tank. They play the game thus: you surrender your empty jug, you get a filled jug. Not the same jug. If you just went off and bought a new jug, boy, are you gonna be pissed. They accumulate those empty jugs and they have Linde or Air Products refill them at their air distillation plant. Yup, they distill air to get all this stuff. And CO2 is abundant and cheap.
Keep your eyes open. Sometimes people throw away beverage jugs. If you recover one, all you have to do is swap it in for a filled jug at a welding supply store.
And you will have 20 pounds of liquid CO2 to use as you see fit.
That's how I got mine. Right out of a dumpster.