gather, process and analyse information from secondary sources to describe ways in which drinking water can be treated and use available evidence to explain how these methods reduce the risk of infection from pathogens
Contamination of drinking water is a common way for pathogens to enter the body.
Drinking water quality NSW Health
More detailed information that would be given to local authorities on procedures for managing drinking water NSW Health Response Protocol: for the management of microbiological quality of drinking water NSW Health
Examples of water treatments are filtration, chlorination and ozone filtration. In NSW water is filtered, chlorine is added to kill bacteria and samples are tested for the presence of coliform bacteria, giardia and cryptosporidium.
Use questions as an effective processing technique to focus your attention when looking for trends in information sources. Some examples in this case might be “Which microbes are controlled by the treatment?”, “Which microbes are not controlled by the treatment?” and “What combination of treatments can be used to make a water supply safe for drinking?”