PR System One and M Series Respironic Ultrafine Filter - Without Tab -50 pcs (50)

These are OEM replacements for the Respironics System One CPAP machine. This particular price is the cheapest I could find. For the ones who had the question about which side faces which way, the side with the words faces inward. And for the ones who read the review about recommending the filter with the tab...That is bad advice. The Respironics System One does not use the filters with tabs and the ones with tabs are too big anyway. They have to be cut down and is more of a pain than anything else. Take it from someone who has tried to make them fit. Just get these and you'll be happy.

There’s something fishy about these filters. I’ve ordered them twice this year (2019). My first order of filters worked just fine. However, with my second order, I noticed right away that the filters look different. They’re the correct size, but something is different about the texture. Also, there’s no writing on one side like before. After using them, I noticed they’re not catching dirt like the previous ones. Usually after a week or so, the filters would get noticeably darker. With the new filters, there’s barely any change in the coloration. I won’t be buying these filters anymore. I don’t care if they’re less expensive— they don’t work!

Perfect for what I needed it for.Recently went on a trip to SE Asia. The PM 2.5 is high there in big cities (India especially) so I bought a new set so I could replace filters every night. Worked great. You can see my picture of what one night does in India. This is with the foam filter with this ultrafine

I have been very happy with these filters and will purchase again. The price is so good I do not have a problem replacing the filter more often (once a week) which is better for cleaner air. Since these do not come with writing on one side they are inserted with the mesh side facing the machine and the fuzzy side against the washable filter.

These are the same filters as the one that came in the CPAP machine. The price is wonderful. Don't have to get these from the medical equipment company and pay an arm and a leg for them.

I love them and at this price I may be able to change them more often than before. Before I was getting them from the company that supplied my CPAP through my insurance company and they were very expensive, so I did not change them as often as I should have.

They will work wonderful. I am so happy to be able to buy them myself and save some money at the same time. Thank-you so much for having them, now I can change them every week if needed since I live in such a dusty area.

Exactly as pictured and described. The price was right. I won’t hesitate to order these again