I have been using respironics dreamstation autocpap for approximately one year.When (b)(6), shipped ultrafine filters instead of ultrafine filters made by (b)(4), i started having problems where mean therapy pressure increased from approximately 9 to 15.I eventually determined that the pressure increase was due to the ultrafine filters becoming clogged.The generic filters are clogged after about 2 weeks of use; the respironics filters are not clogged after more than 4 weeks of use.The generic filters are supplied by (b)(4).
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