Unger Hydropower Ultra Filter LUnger Hydropower Ultra Filter L. The Unger HydroPower Ultra is setting a new standard in deionising filter technology for pure water cleaning. A definite value-add for every professional glass and building cleaner.Over 30% more pure water per resin filling. New formula, perfected for glass cleaning. The FloWater technology 2.0 in every Ultra resin pack ensures and efficient flow of water through the whole tank which optimises the resin saturation. KeyLock function eliminates risk of operating errors. Stable quick-fit metal hose connector. Practical shut-off valve prevents leakage during transport. Pre-installed, dynamic control guarantees optimum water flow at all times. Size: 18 Litres