A hazardous mix of waste is flushed into the sewer every day. The billions of litres of water - combined with unknown quantities of chemicals, solvents, heavy metals, human waste and food - where does it all go? And what does it do to us? Filmed in Italy, India, Sweden, the United States and Canada, this bold documentary questions our fundamental attitudes to waste. Does our need to dispose of waste take precedence over public safety? What are the alternatives?