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I've never known of anyone to use liquid oxygen. I do know that a lot of people use oxygen gas for glass blowing, and I think that would be the same as welding oxygen. Obviously, you want oxygen of a high purity level for inhaling. If you have a regulator, what you want is a non-rebreather mask. They are very inexpensive. There is a better mask, made for people with CH, but frankly if you can get a non-rebreather mask right away -- if you're a member at amazon prime, for example -- I would try that. This one looks fine to me: https://www.amazon.com/Medsource-No-Model-Non-Rebreather-Oxygen/dp/B004Z8V47G/ref=sr_1_1_a_it?ie=UTF8&qid=1499034891&sr=8-1&keywords=non-rebreather+mask I love Twisted-Melon's posts . . . and I think his advice here about dosage is good. But not everyone, including very dedicated busters, has had the success he has had. In my view, you should definitely start the D3 regimen, and look into a pharma preventive. Verapamil doesn't seem to interfere with busting, although it was believed at one time that it did.