Eureka HF-5 HEPA Filter 61830 1 Filter per package. For Eureka upright vacuum series 5700, 5800, and 5900 and Sanitaire SC5845 QUALITY: HEPA (High Efficiency Paticulate Air) filter retains 100% of dust mites, grass and ragweed pollens, plus particles 75 times smaller than the human hair. This borocilicate glass miro-fiber media is mini-plated providing over 250 sq. inches of filter media. For optimal filtration replace the HEPA filter every 6 months.