Replacement Respironics PR System One REMStar 60 Series Foam Filters. Reusable foam filters are an essential component of your CPAP machine. They remove larger particles to let you breathe in the fresh air. The foam filter can be used multiple times and should be cleaned every other week to increase longevity. Easily clean the filter by washing with mild soap and water. For the best filter efficiency, replace the filter every 2-3 months or when deterioration occurs, whichever comes first. 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.