A not-so-sweet new way to test for pee in pools

Story highlights

  • Urine forms dangerous byproducts with chlorine, but it's hard to test for
  • Researchers estimated that one 220,000-gallon pool contained 20 gallons of urine

(CNN)One of the more unforgettable moments from the 2016 Rio Olympic Games was the sight of vibrant green water in one of the competitors' swimming pools which officials attributed to the addition of a cleaning chemical, hydrogen peroxide.

Quickly, the pool was drained and refilled, the clear blue restored.