With the Winix Filter GR, you can keep the air in your home clean with your Winix T800 WiFi. This all-in-one filter has a pre-filter, a carbon filter, and a HEPA filter in 1 cartridge. The pre-filter catches large dust particles and hairs. The carbon filter reduces cooking odors, cigarette smoke, and pet odors. The HEPA filter removes 99.9 percent of the smallest particles from the air, such as fine dust, pollen, mold spores, and dander. This way, you'll breathe in less dust and fewer allergens. You can only use this filter in the Winix T800 WiFi air purifier. Replace the filter on time, so your air purifier continues to clean the air properly.