CB series water purifier cartridges, usable for 3 months. - Model: CB023 - Model: CBC03W - Type: Water purifier cartridge - Included items: Instruction manual, all parts - Quantity: Set of 2 This is a Cleansui CB023 main unit set and a Cleansui CB set cartridge. There are a total of 3 cartridges. I am selling these because the size did not fit my faucet at home. I opened the package to install them, but they are new and unused. Thank you for looking.