Designed for Unger nLite Ultra DI System. Simply switch out used bag with new bag. Bag is made of water-permeable material. Excellent for window cleaning and car washing. Contains a pre-portioned amount of Unger high-capacity premium grade virgin mixed bed resin. Includes a reusable pail for storage and disposal. Water Filters Type: Resin Window Cleaning Filter; For Use With: Unger HydroPower Systems; Filtration Type: Minerals From Tap Water.