HOW DOES ULTRA VOILET WORK? Strong sunlight purifies by permanently inactivating bacteria, viruses, moulds and spores. Almost a century ago, scientists identified the part of the spectrum which is responsible for this well-known effect: wavelengths of 240 – 280 nm, primarily in the UV-C spectrum. Such energy can now be produced commercially by electrical discharge devices and UV technology has been harnessed for a range of applications from disinfection to oxidizing organics. Hanovia UV-systems generate the same ultra violet germicidal rays as sunshine, but hundreds of times stronger. No bacteria, viruses, moulds or their spores can withstand this treatment. next >