With your DreamStation Go portable CPAP machine, you have a choice of 2 different filters.  

The reusable filter should always be used with your machine. It can be rinsed, dried, and reused for long, lasting air protection.  We recommend you replace this filter every 3 months.  It is available in a 2-pack giving you 6-months of service.

The disposable, fine-filter is designed to work in conjunction with your reusable filter.  This ultra-filter picks up even smaller particles in the air before they get inside your CPAP machine, thereby protecting it, and you, from more allergians, dust, etc.  The disposable fine filters should be changed every 30 days and come in a convenient 6-pack size.

These filters are designed to work only with the DreamStation Go machine.