Ozone treatment ineffective against water parasite

Ozone treatment is unlikely to kill cryptosporidium cysts in water supplies, research in the USA and UK has shown. The findings will come as a shock to the water industry which has regarded the chemical as the key to removing the chlorine-resistant organism from drinking water.

Cryptosporidiosis has been a problem for the water companies since 1989, when the water supply to the Swindon and Oxford area was suspected of causing hundreds of cases of the diarrhoeal disease cryptosporidiosis (ENDS Report 176, 12-14). There have been several outbreaks since then, the most recent being in Hull (ENDS Report 182, pp 7-8). Thames Water and Yorkshire Water face civil liability actions relating to the Swindon and Hull incidents.

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