4 Replacement Ultrafine CPAP Filter Without Tab for Respironics PR System One REMStar 60 Series. Replacement Respironics PR System One REMStar 60 Series Ultrafine Filters without Tab. Quantity: 4 Filters (2 Pack - 2 Filters per Pack). Ultra fine filters are an essential component to your CPAP machine. They remove fine particles like dust and pollen to let you breathe fresh air.. These disposable filters should be replaced as soon as there is visible dirt, debris. For the best filter efficiency, replace the filter every month or more often depending on usage and environment.. Use with a reusable foam filter for additional filtration. It is placed inside the machine air intake first before the foam filter.. Designed and made to equal or better quality than OEM at an affordable price. Please Note: These filters are NOT compatible with older REMstar systems.. UpStart Components Brand