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In 1840, ozone was discovered and named for its unique smell. In 1906, the French city of Nice is to establish world's first ozone water purification plant. In 1937, the United States appears first commercial use of ozone-treated pool. In 1940, Indiana, USA for the first time the use of ozone water treatment. In 1975, the nation's more than 1,000 ozone deodorizing device is installed in the sewage treatment plant. 1982, bottled water started using ozone. In 1984, all the Olympic lap pool all to ozone treatment
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