Unger HydroPower Ultra Small Tank Resin is a mixed-bed resin designed for the HydroPower Ultra Tank system, producing pure, deionized water for spot-free, streak-free window cleaning. Unger's FloWater technology is built into the resin bed to optimize water flow, and the manufacturer reports up to 30% more pure water per filling compared to standard resin. No detergents or chemicals are needed, making it a straightforward option for high-rise, storefront, and residential glass cleaning.