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No-one in Rio has explained why the water in the Olympic diving pool turned green. So we asked swimming pool specialist Jo Eckardt in Johannesburg to explain. Image: A lifeguard sits by the edge of the diving pool at Maria Lenk Aquatics Centre on Day 4 of the Rio 2016 Olympic Games at Maria Lenk Aquatics Centre on August 9, 2016 in Rio de Janeiro, Brazil. Credit: Adam Pretty/Getty Images
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