STOCKSHOTS of Tiete River polluted with toxic foam in Salto, 100 km from Sao Paulo city, Brazil. The Tiete River is 1,100 km long, crossing the state of Sao Paulo, and during the dry season, the sewage that is dumped into the river in the metropolitan region of Sao Paulo forms a toxic foam composed of phosphates and phosphorus present in biodegradable household products such as soap, detergent, soap, toothpaste and shampoo, causing pollution. IMAGES