The diagram below describes how storm water is recycled in an Australian city

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The picture shows the process of recycling water from rainfall used in one city in Australia.

Overall, there are five distinct stages in this process, beginning with the initial collection of rainwater from a building’s roof or from any other surface, and ending with the production of clean recycled water which can be pumped to places where it is needed.

At the beginning step of the process, rainwater is harvested by a stormwater drainage system before being passed through dedicated pipes to a water recycling plant for treatment. Step by step, various types of impurities present in water are removed in order of decreasing size in this stage: Firstly, plastic and rubbish are taken away from the raw water, followed by the process of eliminating the tiny particles of dirt. The water subsequently progresses through the next step where it is disinfected to get rid of any disease-causing microorganisms such as bacteria and viruses. After that, the water enters the final step in the stage of treating water, which is designed to remove molecules and salt from within it.

Having undergone the treatment process, the water continues to go into chlorination step, where chlorine is added to water at a concentration of 4 mg/l, and becomes ready to be fed to points of use. However, before treated water goes into the distribution system, it needs to be stored in a storage tank, and a separate network of pipes will be required to get the water to where it needs to be used.