Convenient, easy filtration. The FilterCup is a disposable filter funnel that comes in a range of 70mm diameter filter media. This convenient device is molded from polypropylene with an integral, heat bonded filter. FilterCups offer you a choice of 3 glass microfiber and 3 cellulose filter media. These devices hold a 250mL capacity and have greater than a 31 square centimeter filtration area.They are usually used under vacuum with the FilterCup Stem (available separately). FilterCup units snap easily into and out of the stem which is compatible with filtering flasks and stoppers.