Home overhead water tanks are commonly used in areas with an inadequate municipal water supply or inconsistent supply due to power outages or infrastructure issues. They are typically installed on the roof of a building and are filled with water that can be used for domestic purposes such as bathing, washing, and flushing toilets. To refill an overhead water tank, a motor is used to pump fresh water in, either from a well, or from a municipal supply when it is available. These sources can not be counted on to deliver water of a quality that is safe for human consumption on a regular basis, so it must be monitored and treated appropriately before it is used in the household.
This is a companion discussion topic for the original entry at https://www.edgeimpulse.com/blog/keeping-a-lid-on-your-water-woes