The Salin Plus Air Purifier Device Replacement Filter is designed to work with the Salin Plus Salt Therapy system. This unique filter, made from microcrystalline sediment, provides advanced air treatment for those with breathing difficulties. It's easy to use and can be used in various environments, including apartments, homes, offices, and vehicles. The filter has a compact structure and doesn't have a corrosive effect on the surrounding environment. By using this filter, consumers can enjoy a better night's sleep and breathe easier.