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Disinfection is the most important step in the water treatment process to destroy pathogenic bacteria and other harmful agents. Chlorination is a very common and effective method for the disinfection of drinking water, and it has been the single most important process for assuring the bacteriological safety of potable water supplies.
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Swimming is an enjoyable aerobic activity that can help children develop strength, flexibility, and endurance. A 1991 study found that the hundreds of thousands of young people enrolled in organized swim programs throughout the United States are thinner, stronger, and in better health than their nonswimming peers in a nation where 34% of children are reportedly overweight and up to half do not receive enough aerobic exercise to maintain adequate cardiovascular fitness.
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