This is a gently used cold brew nitro coffee keg. You can make nitro cold brew at home. This come so with 8 filters for making your own cold brew and 1 nitrogen cartridge. You can use regular cold brew along with the nitrogen to make your own. Or brew grounds overnight with your own in the filters. https://www.growlerwerks.com/collections/nitro-for-cold-brew/products/ukeg-nitro-cold-brew-coffee-maker