NSP-X1/ NSP-X2 Filter Set (H12 HEPA)High Efficiency Silver ion air filter (with pre filter) [H12 level] For Aurabeat AG+ Pro Silver Ion Plasma Sterilization Air Purifier (NSP X1 NSP X2) With pre filter General usage, the filter does not need to be replaced for 6 8 months or more Pre filter can be cleaned and reused with a vacuum cleaner Purification Function Pre filter: Intercept hair, fibre fleece, large particles, peeling, etc., can be cleaned with a vacuum cleaner and reused. High