Swimming at the 1948 Summer Olympics – Men's 1500 metre freestyle overall place 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 =
Swimming pool sanitation Other filter media that have been introduced to the residential swimming pool market since 1970 include sand particles and paper type cartridge filters of 50 to filter area arranged in a tightly packed 12" diameter x 24" long (300 mm x 600 mm) accordion-like circular cartridge. These units can be 'daisy-chained' together to collectively filter almost any size home pool. The cartridges are typically cleaned by removal from the filter body and hosing-off down a sewer connection. They are popular where backwashed water from a sand filter is not allowed to be discharged or goes into the aquifer. Automated pool