I bought this about four years ago! I replaced all the filters last summer. I'm selling it because I don't need it anymore due to moving. I'll be getting rid of it at the end of November, so please consider purchasing it by then! There are no problems with the operation, so I think you can use it without any issues. I've thrown away the original box, so it's not available. I will include the instruction manual. This is a used item, so please only purchase it if you understand that.