Got the respironics simply go portable oxygen concentrator.After use i was feeling dizzy, i found my oxygen level was 79.I went to the er and got on tank oxygen.While there we looked at the product booklet and saw it said that the product may have run for twenty minutes before producing pure oxygen.I hadn't been advised of that and by the time i realized there was a problem, the unit had been on for more than an hour.After my level was at 98 for a while i attempted to get home using the portable simply go.After twelve minutes, my oxygen level was at 88.The machine appeared to be pumping and stated it was at two litres.I got a taxi and got home within five minutes, so i could get to my in home oxygen concentrator.Relevant data: i had the respironics evergo portable oxygen concentrator for a year or two before.I never had any problem with my oxygen levels while using that machine.The current vendor says most people choose to go back to tanks.I am too frail to deal with tanks and now much try to research other manufactures and don't know how to be sure to get a product that actually works.
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