The HEPA filter for Dyson hoovers is a product made from the highest quality components, with attention to detail, and is recommended for people struggling with allergies. The correct filtration process makes a significant difference to the air quality in your home. Dyson filters also prevent unpleasant odours. The product can be self-washed under running water, extending its life. The filter captures 99.97% of particles as small as 0.1 microns.