The forecast at the Rio Olympic pool is cloudy with a chance of ... infection?

The Australians again risked being branded whingers after asking swimming officials to clean up the Rio Aquatics Centre warm-up pool over infection fears.

Dolphins assistant coach Michael Bohl felt he had to pull Australian swimmers - including dual world champion Mitch Larkin - from the pool on Thursday because the quality of the water concerned him.

They instead trained in the adjoining - and much more crowded - main competition pool.