More economical and eco-friendly than plastic bottles! And easy! Replacement目安: Approximately 4 months with 10L usage per day. Takagi's water purifier cartridge can purify 1,200L of water with one cartridge. (※Excluding some models) Recommended replacement cycle: Approximately 10L/day → 4 months for a family of 1-2 people, approximately 13L/day → 3 months for a family of 3-4 people, and approximately 20L/day → 2 months for a family of 5 or more people. Only 2.7 yen per liter. Installation is possible in as little as 3 minutes. Replacing the water purifier cartridge is also easy! Brand new, unused item just arrived. Only the outer box has been opened to check the contents, but it is a brand new, unused item.