Summary Auntie Mabel and Pippin are buying some tricks for a children's party, including a fake poo made of plastic. When they get home, Auntie Mabel notices Pippin has made a poo on the path outside her front door. She cleans it up and puts it down the lavatory. She decides to follow Pippin's poo, to find out where the dirty water goes and explores an underground sewer. Auntie Mabel and Pippin fly in Spotty Plane to visit a sewage treatment plant. They see how water is cleaned and returned to the river and how solid waste can be treated and used as fertilizer to be spread on fields. Back home again, Pippin tricks Auntie Mabel into thinking the fake poo is real.

• Adventure
• Family