Originally Posted by dfess1
I use CTS in chonshy, or head up to Blue Bell and hit Posens on 73. Never had an issue with non food grade CO2. To be honest, I didn't know there was a difference, I thought a chemical compound was a chemical compound. Then again I never did all that well in chemistry class...
You are correct that a chemical compound is a chemical compound. The issue is that you can't buy 100% pure CO2 (or most anything else), there are always impurities. The question is what level of impurities are there in what you are buying, and is that considered safe for what you are using it for. For example, tap water has all kinds of scary sounding things in it. The report from my local water utility says that they measured 40 ug / L of barium in my tap water. The federal government claims that anything less than 2000 ug / L is safe, so it's probably safe to drink water straight from the faucet.
There seems to be a lot of confusing information about whether or not the stuff you would find at a welding supply store contains more, less, or the same levels of impurities than food grade CO2. I can't figure it out, so I just figured that since I live in a big city, and don't mind spending a few extra bucks, I might as well go with something suited for the specific purpose I'm using it for. If I lived in a remote area I'd probably make do with welding CO2.