OXO Good Grips GreenSaver Carbon Filter Refills - 8 Pack Activated carbon filter is all-natural and made from coconuts Filter absorbs ethylene gas Lasts up to 90 days Safe, non-toxic, activated carbon filter absorbs the ethylene gas, slowing down the aging process and keeping produce fresh longer To sign up for reminders when it's time to replace your filter, or to learn more about the OXO Green Saver line, visit green saver{dot}oxo{dot}com