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 had about 830,000 litres of water and was a third of the size of an olympic pool. Hot tubs were found to have higher readings of the marker. While urine itself is sterile, its degradation products may lead to asthma. Swimming pool heating costs can be significantly reduced by using a pool cover. Use of a pool cover also can help reduce the amount of chemicals (chlorine, etc.) required by the pool. Outdoor pools gain heat from the sun, absorbing 75–85% of the solar energy striking the pool surface. Though a cover decreases the total amount of solar heat absorbed