True HEPA Replacement Filter is the core of purifying your air and replacing it is essential for optimal purifier performance. Dual-sided filter is comprised of a True HEPA filter with highly efficient, activated carbon honeycomb granules and a durable, mesh pre-filter. It captures viruses and bacteria, including 99.99 percent of airborne coronavirus found by an independent, third-party testing. Activated carbon filter breaks down volatile organic compounds (VOCs) and odors. Pre-filter captures larger particles such as dust and can be handwashed in between filter replacements. Filter is compatible with TruSens Z-6000 Performance Series Air Purifier (not included). For best results, replace the filter every 12 months depending on use. Simply open the side panel doors for easy replacement.