The reusable foam filter from Philips Respironics come in a single pack and are made of blended synthetic fibers with a blue exterior shell. This filter is to be used with the DreamStation CPAP & BiPAP machines. It is recommended to change your machines filter every 2-4 weeks for best use with your machine.
Note: Not Compatible With All DreamStation 2 & DreamStation Go Series Machines.