The diagrams illustrate two simple methods of filtering and storing water for domestic use. Overall, both systems are basic, low-tech setups designed for manual operation.
The first diagram shows a 200-liter metal container containing three layers: sand at the top, small stones in the middle, and pipe holes at the bottom. Water enters through an inlet, passes through the sand, which removes impurities, then through the stones, which provide support and extra filtration. Finally, clean water exits via an outlet pipe for household use.
The second diagram shows a system of three metal containers connected by taps. Water is first poured into the top container containing a sand filter. It then flows through a tap into the second container for further purification. From there, it continues into a third container where the treated water is stored. A tap attached to this final container allows water to be collected in a bucket for use.