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Once I went to strictly welding O2 I thought I was set. But there are still problems sometimes. I usually have to prove ownership of the tank by carrying around the purchase receipts when I have them filled. I often have to exchange my tanks, which I hate but tolerate. I also still carry a print out of my O2 Rx with my portable tank, regulator and mask. But I NEVER mention medical oxygen or Rxs with the welding store. They get really weird about selling welding o2 when you do that. I have two 125 cu ft tanks (M tank) and I fill them with welding o2 for $20 each. I also own 2 E tanks that I fill with a transfill rig I bought off Amazon. These days my O2 bill is down to about $40-60 per month. However, there were some steep up front costs. Each 125 cu ft tank was about $250, and the E tanks were about $50 each. The transfill rig was about $80 off Amazon.

I found that taking it with food helped A LOT. Taking it on an empty stomach, and I had similar results: dizzy and feeling nauseous. But, with food it was fine. Mox

It was a deposit of $150 and $78 for every new tank I get. They provided a regulator and a mask but I bought my own. The delivery is great. They will come the next day