Public water systems often disinfect their water with chlorine. By contrast, bottled water is commonly disinfected by ozone treatment. Ozone is a strong disinfectant, like chlorine, but does not add a strong taste as chlorine does. Both chlorine and ozone will stay active in water for periods of time, but this time period is dependent on a number of factors.

It is still debated currently whether or not bottled water is better than municipal tap water in terms of bacterial content. Bottled water is normally preferred over tap water because it generally does not have the same taste of chlorine present. But taste does not reflect quality. Many of the micro organisms and elements which are found in trace amounts in some water, have no taste at all, and so, taste alone cannot entirely reflect upon the quality of drinking water.

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