Foam Pollen Filters, from Philips Respironics, are required for use with all DreamStation CPAP & BiPAP machines. DreamStation machines should never be run without a foam pollen filter in place.
USAGE:These filters are reusable and should be cleaned weekly or sooner if they appear dirty. They should be replaced every 6 months or sooner if they appear damaged.
NOTE: The white filter material is permanently attached to the blue plastic filter housing. They are not designed to be detached from one another.