Disposable, ultra-fine CPAP filters for the Respironics DreamStation CPAP machines. Ultrafine, disposable CPAP 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 CPAP filters. Remember to replace your disposable CPAP filters every 30 days and the reusable CPAP filters every 90 days for optimal use while avoiding debris buildup. Come with 6 pcs.