The ultrapure water unit is used to produce diluate with a typical conductivity < 0.2 μS/cm by complete desalination of softened water according to the principle of reverse osmosis in combination with electrodeionisation (EDI). It is equipped with a compact rotary vane pump. The PLC Siemens S7-1200 enables visualisation of the unit as well as optimal control and evaluation of the unit operation. Optionally, data transfer via interfaces, remote access and subsequent expansion or adaptation of the control system are possible (on request at extra charge).