I'm changing the cylinders only here. Surprisingly, for some reason, carbon dioxide lasts longer than if you change the balloon in other places. I do not know what this is related to, probably carbon dioxide is enriched with something and therefore the consumption is less.😂
This company, when replacing argon and acid gas cylinders, takes a certified cylinder from you and gives you an unapproved cylinder. At the next replacement, this company issues an invoice for certification. To the question "why did you give me unapproved cylinders?" they answer "if you don't like it, change it somewhere else"