MS18 replacement H13 filter can remove large and airborne particles, including dust, common pollutants , activated carbon filtration reduce chemicals VOCs, tobacco smoke, PM2.5,common household bad smell. Compatibility: MS18 replacement H13 filter is compatible with Membrane Solutions MS18 air purifier. Easy to replace: Simple to install, no tools required, have your filter replaced in just a few seconds. Filters are sealed to protect its service time, so please remove the plastic packaging of the new filters before placing it into the air purifier. It is recommended to replace the filter every 6 months (depending on usage). Package Content: Include 2 replacement filter. Membrane Solutions team is always available to assist you and we will provide a long-term supply of replacement filters. Filtration Performance: TRUE HEPA MS18 Air Purifier filters out 99.97% of particles as small as 0.3 microns and air pollution PM 2.5 (particulate matter). The H13 True HEPA filter is capable of capturing allergens and smoke, while the activated carbon filter is effective in absorbing odors, chemicals and VOCs from the air.