The raised basket lifts fruit, lettuce and vegetables and keeps them off the bottom and sides of the container, preventing moisture build-up. The natural activated carbon filter absorbs ethylene gas and slows down the process of food spoilage. The carbon filter lasts up to 3 months and can be replaced at the right time thanks to the date display. Another reason for spoiled fruit is the wrong level of moisture: Different fruits and vegetables require different levels of moisture to stay fresh. An adjustable ventilation is integrated in the lid of the Greensaver Box, which can be opened or closed as required. BPA free.