Keep your Airsopure air purifier functioning at maximum capacity. This simple replacement kit comes with everything you need to replace the filtration systems in your S-900 air purifier. Enjoy the protection of multilayered filtration with a fresh pre-filter, HEPA filter, and carbon filtration panel. A replacement UV bulb for the germicidal lamp kills infectious microorganisms. Easy instructions guide you through the replacement process, so you can enjoy maximum protection with minimal effort.