You're probably right about the regulators, I just didn't know if there were some that were used on beer kegs that might be different from the ones we use for calcium reactors. I think I'm on the trail of a 20# from CraigsList. Let me check that out and if not I'll be back in touch with you.
u are safe with the beer keg ones. i have used mine for both applications. the 20# will save you money as they are much cheaper to fill $$/lbs. Good luck and give me a call if you do not find one.