The Miele SF-SAC20 SF-SAC30 Super Air Clean Filter retains 97.95% of particles down to 0.5 of a micron and 94% of particles down to 0.3 micron.If you need more filtration then look at the Hepa filter SF-AH30 or SF-AH50 depending on your model vacuum.

Filter lasts as long as 4 dustbags.

MIELE super air cleaner SF-SAC 20 SF-SAC 30 For models S200-s858,S 4000,S 5000