Brand new, unopened. Please refrain from price negotiations. Thank you. Price: ¥2,800 Sharp Genuine Ag+ Ion Cartridge for Humidifying Air Purifiers FZ-AG01K1, 1 piece Compatible models: KC-H50, KC-A50, KC-G50, KC-Z45, KC-G40, KC-B50, KC-F50, KC-D50, KC-E50, KC-B40, KC-J50, KC-Z40, KC-Y45, KC-W45, KC-F70, KC-A70, KC-A40, KC-E40 (Compatible models listed in the product description) The FZ-AG01K1, described as being for humidifying air purifiers, can also be used in humidifiers and humidifying ceramic fan heaters. Replacement目安: Approximately 1 year: When using an average of 2.5L per day, the total usage is approximately 900L. The replacement time may be earlier depending on water quality and usage environment.