Drop in alkalinity to blame for green pool - Rio organisers

2016 Rio Olympics - Water Polo - Preliminary - Men's Preliminary Round - Group A Australia v Japan - Maria Lenk Aquatics Centre - Rio de Janeiro, Brazil - 10/08/2016. Water turns green in the diving pool of the Aquatics Centre. REUTERS/Kai Pfaffenbach

RIO DE JANEIRO (Reuters) - The Rio Olympics diving pool will be back to its blue colour later on Wednesday, Games organisers assured, blaming a drop in alkalinity levels for an uninviting green hue during competition on Tuesday.

The water in the pool was bright green on Tuesday, baffling competitors in the women's 10 metre synchronised event, who said they could not see their partner underwater.