This is a chlorine removal cartridge specifically for the ReFa FINE BUBBLE PURE shower head. I purchased it from the official store, but it doesn't fit my shower head model, so I'm selling it. The package has been opened once, but the cartridge is unused and new. Compatible Model: ReFa FINE BUBBLE PURE (Please note that it is not compatible with FINE BUBBLE U or S) - Authentic Cartridge: 1 - Condition: New, unused (only opened) - Purchase Date: July 29, 2025 - Retail Price: 2,500 yen (tax included) Instant purchase is welcome, and I can ship within 24 hours. ☺︎