“All in one” unit in a cabinet with emergency supply for safe supply of analysers. All components (pretreatment, reverse osmosis, storage tank, pressure booster, external polishers for residual desalination as well as 0,2 μm sterile filter) are premounted ready to connect. Multilingual microprocessor controller with LCD display for controlling and monitoring pure water systems. Display of permeate and pure water conductivity. Fully automatic rinsing cycles, potential-free fault reporting relay. Module-based capability of increasing capacity at a later stage.