DreamStation Go Machine Air Filters. This is your choice of a reusable pollen or disposable 30-day fine filter. Features: Reusable filterEvery 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 filterFor 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.