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Hi All, I am 2 weeks into my cycle, and finally got the o2, which was not easy as the insurance company was not cooperating. anyhoo... I now have my M60 tank @ 15lpm. I am trying to get down the method for taking the o2. The non-rebreather mask does not seem to work so well for me, but I may be doing it wrong. I felt like breathing normally in the mask, did not give me full o2, but a mix of expelled air and o2 mixed. My method was to fill the bag (hold finger on valve), then breath in deeply (via mouth), remove mask and exhale, then repeat. After about 8 minutes or so, my lips and face would start to tingle- this did not give me a good feeling. Ultimately using this process, I would get the beast to retreat after ~15mins, but the tingling face cannot be good, and I am wondering if I am messing up my o2/co2 levels in the process? I'm actually nervous to use the o2 again because of this feeling. Should I be leaving the mask on, and doing much shallower breaths? I feel like I am emptying the bag and then waiting for it to fill again, at 15lpm. I am aware of the clusterO2 kit but not sure if that is my current issue, and using the o2 again has me very weary. Please offer any suggestions or tips, thanks in advance!! Mike