Rio Officials: Hydrogen Peroxide Caused Green Pools

In the latest episode of the soap opera “As the World Turns ... Green,” we now have a more definitive explanation from Rio Olympics officials as to why pools used for diving and water polo turned from blue to green: hydrogen peroxide.

Officials said 160 liters (or more than 42 gallons) of hydrogen peroxide was mistakenly added to the pools on Aug. 5, The New York Times reported. The hydrogen peroxide neutralized the chlorine and allowed the growth of “organic compounds” that might have included algae, according to the report.

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