nyresq once bubbled...
By law to produce or make Nx or Tri-mix your supposed to have a manufacturing liscense.
who regulates this law? is it a federal dot reg? the tax thing I can understand, but what agency is the license to make trimix from?
as for tumbling, I've never heard of a shop saying "sorry for rusting your tanks, I'll give them a tumble..." but I have heard many of them say "how do I know you didn't get a fill of bad air someplace else, I'll do it, but it will be $15 plus another $10 for the VIP, but the rust can't be from me...":upset:
Well, you have heard of it now. I'm a LDS owner that likes to take care of MY customers. I have a personal relationship with my customers and that's just the way it works or should work. So now you have officially heard of this happening. However; I don't doubt at all about other shops screwing the customer this way.
As for who regulates this law. It may be an OSHA permit you have to get. I'm working on this now since I might just start pumping air and NX out of my shed.
Once you start mixing air and O2 you are now a manufacturer of this new product, which we call Nx or Trix-Mix, etc. etc.. Hence why the Govt. wants some money.
I think it's horse crap we have to pay sales tax on an air fill...But we do.