The given picture depicts a method by which residents living in an Australian town collect and transform rainwater into drinkable water. From an overall perspective, it is evident that rainwater from drains experienced both physical and chemical treatments to reach the standards of water used for drinking purposes.
In the initial step, rainwater falls on roofs and pours into gutters. The water flows along inside drains to reach the water filter, where some objects such as leaves or dust are eliminated. Next, the filtered water enters a storage container.
As the final step, the water stored is pumped into a treatment tank to be treated with chemicals. After this step, the water is led back to homes through pipes. At this time, the water is pure enough for residents to drink.
To summarize, this town follows four steps to purify rainwater, consisting of collecting, filtering, storing, and treating with chemicals.