The modern EPA-11 filter reduces the emission of particles/fine dust/suspended matter into the air. Without a filter, the fine dust would simplY be released back into the air.
We recommend replacing the filter everY three to six months or as needed and not washing it off, otherwise the filter could be damaged.
This EPA-11 filter is e.g. Compatible with the TechniSat TECHNIMAX AS MINI cordless vacuum cleaner.