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sedimentation
wate is stored in large tanks. this slows down water flow allowing large insoluble particles on settle at the bottom
filtration
the water is sprayed onto layers of sand and gravel meaning smaller and insoluble particles are removed
chlorination
chloride ga is pumped into water to sterilizes it
why do we treat water
because it contains harmful microorganisms and insolubles. it is done to remove harmful substances from water before giving it to the public.
Note 
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