The bodily waste of up to a million people from Bristol and the South West is collected at the works, which is fed by Bristol's four major sewer systems and treats on average 210 megalitres per day – that is 210 million litres of sewage. Before this treatment works was built, the raw sewage from Bristol would simply be pumped into the River Avon. On this fascinating visit you will find out how sewage is dealt with sustainably.