groundwater from the wadi alluvium and some from the bedrock. Historically water from the well was drawn via ropes and buckets, but since 1964 the well's opening itself is in a basement room inaccessible to the public, where it can be seen behind glass panels. Two electric pumps, operating alternately, move the water 5 km southwards at a pace of between 11 to 18.5 litres per second to the King Abdullah bin Abdulaziz Zamzam Water Project in Kudai. The center opened in September 2010 CE costing 700 million Saudi Riyal to construct and being operated by the National Water Company of Saudi Arabia. In this location treatment using filters and ultraviolet light, storage, and distribution take place. Once treated the water is stored in one of two reservoirs, the first at the plant's location in Kudai can hold 10,000 cubic meters of water, the other, the King Abdulaziz Sabeel Reservoir in Medina, has a larger capacity of 16,000 cubic meters. The Kudai location is connected via pipes to drinking fountains in the Masjid al-Haram. The Medina location supplies the Prophet’s Mosque. Aside from the system of pipes unbottled water is distributed using tanker trucks which transport 150,000 litres per day at normal times and up to 400,000 litres per day during pilgrimage seasons to the Medina location. Unbottled water is available through the before-mentioned drinking fountains, a fountain meant for pilgrims wishing to fill larger containers not intended for immediate consumption, and sterilised containers placed by authorities throughout the holy sites in Mecca and Medina. These latter containers come in several variants, chilled and unchilled, as well as being either stationary or worn as a backpack by employees of the complexes with disposable plastic cups provided in any case. Small filtered water bottles are also distributed free of charge at the holy sites. The water distributed this way in the Masjid al-Haram totals ca. 700,000 litres per day outside of pilgrimage season and 2,000,000 litres per day during said season. Distribution outside the Islamic holy sites within the Kingdom of Saudi Arabia occurs with the water being bottled in 10-litre-containers which are sold directly at a warehouse at the site of the King Abdullah bin Abdulaziz Zamzam Water Project or via hypermarkets and super stores throughout the state. In 2018 the number of 10-litre-containers distributed per day was 1.5 million. In 2010 the annual limit on how much water can