In many parts of the world, water is not safe enough to drink. There are basic qualitative observations that quickly determine if water is not safe. However,there are many “invisible” substances that must be tested for professionally to identify the contaminants and to figure out how the specific polluted water can be purified. Testingcan be done in the fieldwith portable test kits or mobile laboratories. Water samples can also be collected and sent to a professional laboratory.
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