Dainichi Humidifier Easy Replacement Filter HD-LX Type Disposable Type, Set of 2 This is a new, unopened product. ● This sample is a disposable "Easy Replacement Filter" (filter color: reddish-purple). Just throw it away when it's dirty! Recommended for those who want to replace the filter without washing it. Simply replace the filter with a new one every 3 months, eliminating the need for maintenance. (Based on 8 hours of operation per day, with tap water hardness of 50mg/L (national average))