Nine beaches in Sydney, including well-known Manly beach, were closed to bathers on Tuesday after small white and grey balls of debris washed up on the shores at the height of the summer holiday season.

Sydney’s pumping of primary-treated effluent into the ocean makes us out of step with the rest of the world, a water engineering expert said.

Nine beaches in Sydney, Australia, have been closed after mysterious gray debris shaped like small balls washed up ashore. The discovery of the marble-sized balls comes just months after a similar incident in October of last year, where thousands of washed ...