Swimming at the 1948 Summer Olympics – Men's 1500 metre freestyle Swimming at the 1948 Summer Olympics – Men's 1500 metre freestyle The men's 1500 metre freestyle event at the 1948 Olympic Games took place between 5 and 7 August, at the Empire Pool. This swimming event used freestyle swimming, which means that the method of the stroke is not regulated (unlike backstroke, breaststroke, and butterfly events). Nearly all swimmers use the front crawl or a variant of that stroke. Because an Olympic size swimming pool is 50 metres long, this race consists of 30 lengths of the pool. Key: Q = qualification by place in heat, q = qualification by
Swimming pool sanitation Swimming pool sanitation Swimming pool sanitation is the process of ensuring healthy conditions in swimming pools, hot tubs, plunge pools, and similar recreational water venues. Proper sanitation is needed to maintain the visual clarity of water and to prevent the transmission of infectious waterborne diseases. Sanitation methods include a water filter to remove pollutants, disinfection to kill infectious microorganisms, swimmer hygiene to minimize the introduction of contaminants into pool water, and regular testing of pool water, including chlorine and pH levels. The World Health Organization has published international guidelines for the safety of swimming pools and similar recreational-water environments, including