Miele's HEPA AirClean filters meet Europe's stringent HEPA 13 standards, capturing over 99.95% of all particles, down to 0.1 microns. Once activated, a TimeStrip® releases a red line of liquid over the course of one year, reminding users when it's time to replace their filter.• For S2000, S300-S700, S2000, C1 canisters and S7000 uprights