One has been opened, but is unused. Two are unused and unopened. I am selling these because they are a different type than I needed. These are Cleansui water filter cartridges, a set of 3, with instructions for replacement. - Brand: Cleanup - Product Name: Water Filter Cartridge - Model Number: ZSRJT302R09AC - Quantity: 3 cartridges - Replacement Instructions: Instructions for replacing the water filter cartridge are included. Thank you for looking.