Advantages compared to other products The product uses activated carbon with a pore diameter of less than 2nm. The specific surface area of the micropores in the activated carbon accounts for more than 95% of the specific surface area of the activated carbon, which is currently the activated carbon with the largest adsorption capacity. The H13 HEPA filter of this product is a real medical grade H13 HEPA filter, which is recognized as the most efficient filter material in the world. The four filter forms of interception, gravity, airflow and electrostatic adsorption ensure that every breath of air you breathe is fresh. pure cool link air purifier filter Made from high-quality HEPA material and premium activated charcoal, this pre-filter and filter set is compatible with Dyson HP04 Pure Hot + Cool air purifier and Dyson TP04 and DP04 purifying fans. HEPA Filter replacement with Dual-layer filtration can purify the air deeply,activated carbon filters remove harmful gases. Sealed HEPA filters can capture 99.97% of ultra-fine particles down to 0.1 microns. hepa filter replacements The filter is easy to install and can be washed. After washing with warm water and drying in the sun, the performance of your air purifier can be restored to the best. It can give you 12 months of long-term protection. tp04 Perfect Replacement for Dyson Air Purifier Filters TP04, HP04 & DP04 Compare to Part # 968707-04, 968708-04 and 969048-01. Package Contents： 1 HEPA air purifying filter set compatible with Dyson TP04, HP04 and DP04 1 activated carbon pre-filter set compatible with Dyson TP04, HP04 and DP04 1 bonus cleaning brush Disclaimer: This is not a Dyson OEM product. Compatible with Dyson Pure Cool DP04 Air Purifier and Fan,Pure Hot + Cool HP04 Air Purifier Heater and Fan,Pure Cool TP04 Air Purifier and Tower Fan.Compare to Part # 968707-04, 968708-04 and 969048-01. A sealed two stage 360-degree filtration system composed of HEPA filter and activated carbon filter. It can effectively filter 99.97% of pollutant particles as small as 0.1 microns. Give the most favorable protection to allergic people, rhinitis patients and young children. The activated carbon filter in the set contains more activated carbon particles than other products. The adsorption effect of activated carbon particles can better enhance the filtering effect of your air purifier. Because there are more activated carbon particles, it is second to none in removing odor. Give you and your family fresh air. The filter is easy to install and can be washed. After washing with warm water and drying in the sun, the performance of your air purifier can be restored to the best. It can give you 12 months of long-term protection. This product contains 1×HEPA filter, 1×internal activated carbon filter and 1× cleaning brush.