Please read the profile before purchasing and commenting. As stated in my profile, I have received many items as gifts or hand-me-downs, so I cannot answer questions about the purchase date, location, or how many times an item has been used. Comments from those who haven't read the profile will be deleted. Please refrain from purchasing if you are concerned about minor details. This is a set of 3 long-lasting water purifier cartridges using a high-removal CAT filter. - Product Name: ZSRJT002R12BC (Set of 3) - Material: ABS resin - Filter Type: CAT (High Removal) - Suitable Water Quality: Tap water - Maximum Flow Rate: 1.5L/min - Usable Water Volume: 1500L - Replacement目安: Approximately 4 months (when using 12.5L per day) Thank you for viewing.