Majority of pools now a days don't even use Chlorine anymore. News ones, at least. They use a new type of salt concentration. The water is constantly cycled through a filtration system that puts the water under pressure seperating it from any foreign particles. The often heavier particles fall to the bottom of the filter and are killed by salt. So you have actually constantly purified and fresh water in the pool.
Actually the salt is used to make chlorine, like the MSR MIOX device, but on a larger scale. In large pools this methode is prefered, because this methode does not requite chlorine transports.
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