Hanovia ultraviolet water disinfection systems are helping the Silver Spring Mineral Water Company in the UK ensure its products are free from microbial contamination. UV is highly effective at destroying all water-borne micro-organisms, including bacteria, yeasts and moulds. Recent independent tests have also shown it to kill Cryptosporidium. It does not affect the pH or chemical composition of the water, ensuring the flavour is not affected. Each UV system consists of a stainless steel treatment chamber containing one or more UV-emitting arc tubes. Water passes through the chamber and the UV kills any micro-organisms present by disrupting their DNA. Seven Hanovia UV units are installed at Silver Spring, the oldest being in use for over seven years.