The Sleep8 Sanizing filtered bag is a required accessory for your Sleep8 Sanitizer. Inside the Sleep8 Sanitizing Filter Bag is a Carbon Filter that will ensure the activated oxygen that is released during the sanitizing process is converted back to regular oxygen as it leaves the sanitizing bag. Once the Sleep8 device is connected to this filtered bag, all enclosed CPAP components can be simply and safely sanitized. We recommend changing the bag every 3 months with daily use to maintain the performance of the Carbon Filter. The best practice is to replace monthly.