FEATURES Compatible with Airthereal Revive Electric Kitchen Composter only. Activated Carbon Filter: Absorbs odors, and food waste smells during the composting process. Remove the Filter label: Pop off the back panel and remove the black stickers from the back of the carbon filter before installing. Make sure the side with the arrow facing upward. Then reinstall it into the composter. Biodegradable: The filters are 100% biodegradable and 100% chemical free. The paper box is biodegradable and 100% organic. The filter and packaging can be put into your outdoor compost pile (not the electric composter). Service Life: Each filter lasts up to 2-3 months of normal use. A 2-pack will provide you with 6 months of cleaning. WHEN TO REPLACE? Replacing the air filter every 2-3 months is recommended for optimal use (or according to your air filter status). It is time to replace the air filter when the following signals appear: Clogged filters or the presence of odors from the unit. HOW TO REPLACE? Remove the filter cover from the electric composter. Locate and remove the old filter. Install the new filters. (Note: take off the black stickers before installing the filters.) After replacing the filter cartridge, press and hold the filter reset indicator light for 3 seconds. The red light will go off, the life of the filter cartridge will reset to zero, and the life of the new filter cartridge will be counted again. NOTE The biodegradable activated carbon filter can be stored for 6 months in the working environment of the kitchen composter and can be stored for more than 1 year in a normal sealed environment. If it will not be used for a long time, please remove the activated carbon filter and keep it sealed.