PROsystem works on the basis of electroosmosis, sends pulse waves into the walls and reduces the surface tension of water molecules, i.e. changes the direction of movement of water particles towards the negatively charged soil. The operation of the system also prevents moisture from rising again. The systems must be permanently installed on the facility and should be taken care of as required by the electronic device. With PROsystem technology we made a step forward in the preservation, but we also raised the value of historic buildings. For years the company KAZ Ltd. Zagreb is contributing to the preservation of valuable historic buildings as well as facilities for various purposes (schools, hospitals, churches, palaces …) with special emphasis on buildings under the protection of UNESCO: Euphrasian Basilica in Poreč – pearl of Byzantine period, the Rector’s Palace in Dubrovnik, Diocletian’s palace in Split – one of the best preserved monuments of Roman architecture in the world.