The water reservoir of the laundry is located in the neighborhood of Abbasqoli Khan and a space known as Baba Jamal Chu Ghori (Baba Jamal Pit). This huge building has a dual function. The main part was the laundry and the second part was the city water storage.
The water tank of this laundry was built in 1307 by the late Ali Akbar Tawfighi (Mayor of the city). The architect of this complex was the brothers Akbar Bana and Ostad Ismail, which took 15 months to build. The water of the laundry complex is provided by Haji Mir Bahauddin aqueduct.
The implementation of the tank was done by the Gurghi method and the walls and floor were sealed with Saroj mortar up to a height of 2 meters.
At the end of the arches and the south wall, there is a window for air exchange, which is remarkable in its own way.
In the recent renovations of this complex, the water tank has been changed as an exhibition.