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Rio organizers admitted on Saturday they will have to drain the now-notoriously discolored water polo and synchro pool in the Maria Lenk Acquatics Centre, where the water has become so darkly green that there is no visibility underwater and it is unusable for competition. The pool will be drained Saturday night following the women’s three-meter springboard event. The adjacent diving pool will merely receive new filters, as divers do not need to see underwater unlike synchro competitors.

In a surprise press conference at the venue, Rio 2016 spokesman Mario Andrada presented yet another explanation for the strange mutating of the pool water from crystal blue to algae-green this week: on Aug. 5, 80 liters of hydrogen peroxide were mistakenly put in the pool manually by a local contractor, which neutralized the chlorine’s ability to kill organics.

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Ever since the pool changed colors on Tuesday, Andrada had issued public assurances that the organizers had the problem in hand and the water would return to blue “shortly.” But late Saturday afternoon he said organizers regretted “over-promising and under-delivering” on the state of the pool.