Reusable foam filters designed for the Respironics REMstar Plus, Pro, and Auto CPAP machines. Two washable foam filters per package. Foam pollen filters are an essential component for your CPAP therapy due to their ability to remove irritating dust, pollen, and tobacco smoke particles from your CPAP airflow. Not sure which CPAP filters fit your machine? Please call CPAP Supply USA for help with choosing your filters.