Mysterious grey balls sparking the closure of nine popular beaches could have origins in sewerage and need to be treated with caution, an expert says.

Mysterious grey balls sparking the closure of nine popular beaches could have origins in sewerage and need to be treated with caution, an expert says. Sign up for our newsletter to stay up to date.

Mysterious grey balls sparking the closure of nine popular beaches could have origins in sewerage and need to be treated with caution, an expert says. Large, peaceful protests in major cities have ...

Mysterious grey balls sparking the closure of nine popular beaches could have origins in sewerage and need to be treated with caution, an expert says. Subscribe Today's Paper Today's Paper ...

Mysterious grey balls sparking the closure of nine popular beaches could have origins in sewerage ... Large, peaceful protests in major cities have marked Australia Day while others enjoyed the ...