Green pool drained and refilled for synchro events
OLYMPICS organisers said they would pump millions of litres of green water from a Rio pool after admitting defeat in attempts to get it back to blue.
In a "radical" step, 3.73 million litres would be replaced at the 50m water polo pool, which starting hosting synchronised swimming yesterday.
Officials blamed hydrogen peroxide, added to the pool by a contractor, as the cause of the pool turning a murky green.
Clean-up efforts are also failing at the adjacent diving pool, which is a darker green and smelled like a "fart" on Friday, according to one diver.
But while the diving pool can stay green without affecting competition, venue manager Gustavo Nascimento said synchronised swimming requires crystal-clear water.
"We've been trying for four days.
"Obviously, it's not going as fast as we wanted... so we're going to change the water," he told a press conference.
"We're going to drain the water from the competition pool and we're going to pump the water from the warm-up pool into the competition pool," he added.
The operation should have be finished by 7am on Sunday (6pm yesterday, Singapore time), Nascimento said - four hours before synchronised swimming got under way with the duet free routine.
Mr Nascimento said the diving pool and then the bigger pool next to it turned green because a contractor added 80 litres of hydrogen peroxide, which neutralised the chlorine.
Hydrogen peroxide is used in the cleaning of swimming pools but it should not be mixed with chlorine, he told reporters.