The Produce preserver replacement filters absorb ethylene allowing the ripening process of many produce items to slow down. As a results, certain produce items will stay fresh longer that are kept in your crisper drawer. It extends freshness of produce up to 25%. This kit includes 2 replacement filters and 1 status indicator which will be put in the housing in your crisper drawer. The status indicator helps you remember to change the pouches. Replace pouches and status indicator every six months for optimal freshness. The Produce Preserver Starter Kit which will include the housing, 2 filters and 1 status indicator is part number W11462816