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…showed last 75 words of 662 total…on UV disinfection for their drinking water protection including Helsinki Finland, Milan Italy, and Motala Sweden Ozonation Ozone has also been used for several decades in Europe for taste and odour control, colour removal as well as disinfection. Ozone acts as an excellent disinfectant; it produces no chlorinated by-products and is effective against Cryptosporidium and Giardia. Ozone does produce other disinfection by-products including ketones, aldehydes and bromate. These can be removed through a filtration process.