could i crack cylinders in my grow room for co2? would it be dirty?

yes u can but it will get pricey.also viniger and baking soda in a bottle will work

vinegar and baking soda will do the job but if u already have the co2 bottles ya may aswell rip a few open every now n then, they're only like 80pence each anyway and im sure u will get more enjoyment from blazzing up than shootin beer cans, even more enjoyment when blazzing up and shooting beer cans

CO2 is CO2 is CO2
It's a chemical formula. Two oxygen atoms covalently bonded to a single carbon atom.

Why not make your own alcohol? Yeast + Sugar co-creates CO2 + Alcohol when fermented, etc.
C6H12O6 → 2 CO2 + 2 C2H5OH

__________________
- NO TELL
- NO SMELL
- NO SELL

Bubble slow and you'll get it eventually.