How rain water is used for drinking water in Australia is shown in the graph. It has four stages in total.
The first stage is rain falling on roof, the rainwater flow the wall of house into a water filter. It is good for collecting enough water, preparing for subsequent processes. In the next stage, this rain is cleaned by a water filter, and the rainwater becomes water storage. The third stage is the most important stage, chamicals are added water treatment , then these chemicals can kill germs. The water then turns into drinking water. In the last stage, the drinking water through water pipe is used by local residents.
Before become drink water, rain has three forms. They are rain, water storage, and water treatment respectively. The cycle process is beneficial for saving much reasource of water, people need to keep the good behavior and enhance the program.