High-grade water filter cartridge, replaceable every 3 months. I am selling this because I no longer use Cleansui. - Quantity: 1 - Model: CPC5Z - Filter Type: Antibacterial Filter - Usage Period: 3-month cartridge - Grade: HIGH GRADE - Condition: Unused Although it is a new, unused item, please note that the box may have some deterioration due to long-term storage. Available for immediate purchase.