The HEPA filter for Dyson vacuum cleaners is a product made of the highest quality components, with attention to every detail, recommended for people struggling with allergies. The right filtration process significantly affects the air quality in your home. Dyson filters also prevent unpleasant odours. The product can be washed under running water on its own, which extends its life. The filter captures 99.97% of particles as small as 0.1 microns. The set includes two filters.