This text is possibly improperly researched or the writer and/or Web page is attempting to dupe the readers(who are almost certainly seniors who truly have to have a concentrator) for that sake of sales. There isn't any other clarification. Either way it’s rather sleazy. Portable oxygen concentrators are generally designed https://airfryeroven00876.59bloggers.com/20086947/the-basic-principles-of-zen-o-portable-oxygen-concentrator