Cairo includes many sabils, and perhaps the most famous of them is Sabil Muhammad Ali in al-Aqqadin, which was established in 1820 as a charity in memory of Muhammad Ali Pasha's son, Prince Tusun. The purpose of its establishment was to facilitate obtaining pure drinking water throughout the year, particularly when the Nile water level is low, and this has been done by storing water in a cistern under the tasbil room. It is considered one of the largest remaining cisterns in Cairo. It has recently been subjected to many violations, which led to an evident deterioration in its architecture as well as its cultural, historical and aesthetic value. This is mainly due to the negligence and the variety of factors that damage the stones used in building the Sabil, such as climatic conditions, groundwater, and wrong restoration. Accordingly, this led to limestone being affected by weathering, particularly salt weathering, which led to the spread of many manifestations of damage in Sabil Muhammad Ali including seepage, efflorescence, fragmentation, potholes, gaps, and falling blocks, ornaments and decorations.