The Respironics Dreamstation CPAP and Bilevel machines are used with two different filters; the Ultra-Fine filter works on the small air particles. Best used with the Dreamstation Pollen filter. It is disposable and recommended to be replaced every month, do not wash. Sold as a pack of 6.
My order was fine but I received a piece I did not order I think it is the water reservoir I did not open the box can I return once I feel safe to come to your store
It was fine just would like my new machine since mine is one recalled taking far too long to correct this