The world's largest and deepest pool is San Alfonso del Mar, in Algarrobo, Chile. Algarrobo is a Chilean city and commune in San Antonie Province, Valparaíso Region. It has a population of 8,601 people.
The pool is 1000 meters wide and up to 35 meters in depth and holds 250 million tonnes of seawater. It took 5 years to build and cost nearly 1 billion.
Since the pollution levels in the ocean could cause all sorts of cancer, mental retardation, birth defects and seriously shorten life expectancy, the Chileans had to come up with a solution that would make swimming safer but just as enjoyable. So they created a computer-controlled filtration system that permanently draws fresh seawater directly from the ocean while pumping out used water. This way, tourists can swim in a clean environment where they can see the bottom even in the deep end, all without polluting the ocean.
The sun warms the water to 26c, nine degrees warmer than the adjoining sea.
Among the activities in San Alfonso del Mar you will find: sailing, kayaking, scuba diving and of course, swimming.
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