The system Vulcan 5000 is an economic alternative to expensive heat exchangers, i.e. closed circulations of coolant with treated water. These heat exchangers cost about 5,000€. The device Vulcan 5000 has been used on a trial basis since the end of March to treat the coolant of our gas laser. On the 12th of December the company coherent GMBH checked the laser tubes for lime deposits on the ceramic surface. No lime deposits were detected, therefore, it is in all a positive result.