Wikipedia
Cheshmeh-Ali (Shahr-e-Rey)
Cheshmeh-Ali (" Spring of Ali") is an ancient recreational place, located in the south of Tehran and north of Rey. The spring is spot in the neighborhood of Ebn-e Babooyeh, Tughrul Tower, and below the Rashkan castle and next to Rey Castle and Fath Ali shah inscription. In the past, carpet salers and people used to wash their carpets there, with their idea that the property of this spring water is good and clean for carpets and make them full lighter color by its mineral water.