DreamStation Go Machine Air Filters.

This is your choice of a reusable pollen or disposable 30-day fine filter.

Features:

• Reusable filter
  Every 6 months, replace your DreamStation Go reusable filter. Philips reusable replacement filters help clean the air you breathe by capturing dust, pollen, mold spores, pet dander and more with an 88% efficiency at 7-10 micron.
• 30-day fine filter
  For enhanced filtration, try our 30-day disposable fine filter. Philips 30-day disposable replacement fine filters help clean the air you breathe by capturing dust, pollen, mold spores, pet dander and more with a 95% efficiency at .5 - .7 micron.