These are brand new. We remodeled our entire house which included getting a Waterdrop system in replacement of our Kinetico. Description: These are OEM replacement purple carbon and orange sediment filters that are used in the reverse osmosis systems mainly found in the cities and boroughs. These are to be replaced at least once a year or at 500 gallons when the machine shuts off, whichever comes first. Filter Reverse osmosis Waterdrop Drinking water