Respironics Pollen Filters (2 pack) for M Series and System One CPAP and BIPAC devices (1029330).Be sure that you are breathing in fresh, clean air through your CPAP machine. These Reusable CPAP Filters for M-Series, 50 & 60 Series, System One fit Philips Respironics M-Series, System One 50 or 60 Series CPAP and BiPAP machines. The convenient 2-pack means you will have spare CPAP filters on hand whenever you need to wash the one you are using. You can rewash and use these filters 2 to 3 times before replacing.Have several packs in stock. CPAP America is your one-stop-shop for all of your sleep apnea needs!