Takagi water purifier cartridge JC0036UG. This is new and unopened, but has been stored at home after purchase. It was manufactured in 2019, so it's priced a little lower. According to Takagi's website: Unopened cartridges: There is no expiration date: Since the performance does not deteriorate if unopened, there is no particular expiration date. Early use is recommended: However, even in an unopened state, there is a possibility of absorbing odors, so it is recommended to start using it as soon as possible after it arrives. Please consider purchasing with the above in mind.