Keep fruits and vegetables fresher longer with the PureAir PK-2 Produce Keeper Plus. Now you can help preserve the taste, color, and freshness of fruits and vegetables with this advanced filter. It uses antioxidant technology to capture and neutralize ethylene gas, the natural gas that causes produce to ripen quicker. The PureAir PK-2 Produce Keeper Plus also has a carbon layer that clears the air and absorbs undesirable odors to maintain freshness and keep produce tasting great. Reduce food waste, save money, and enjoy produce with a longer storage life. Designed to provide long lasting performance, this filter should be replaced every 12 months for optimal performance.