The UV light form low-pressure or medium-pressure mercury vapor lamps inactivates the DNA of the harmful germs and thus reduces the number of germs to the legally prescribed maximum quantity – for example in drinking water. No chemicals are used, nor do undesirable or even harmful by-products arise during disinfection. Pathogens that are resistant to chlorine, for example, are also reliably killed. The natural taste, smell, colour and pH value of the water are not affected by treatment with UV light.
Eta Plus, the subsidiary of UV system manufacturer IST Metz, based in Nürtingen near Stuttgart in southern Germany, produces UV lamps and electronic ballasts used for these purposes. They are used, for example, in the municipal water treatment plants of Basel, Paris and San Francisco. The UV lamps are used, among other things, to break down pollutants in drinking water, disinfect wastewater, ballast water on ships or in industrial water treatment.
Clean air makes the difference: Further information is available here.