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Different treatment is used depending on the source of
your water. Ground water taken from wells has been
filtered through rocks, so it is usually quite free of
particles. It can still contain chemicals and organic
matter that must be taken out, though. If your water comes
from a surface-water source, such as a river, some work
must be done to get rid of particulate matter. In this
case filters are used to screen out large particles, and
at a minimum, chlorine is added to kill dangerous bacteria
and microorganisms. Some systems have additional water
treatment, such as adding chemicals to make matter bunch
up (flocculate) and fall out of solution and adding
chemicals to make the water less corrosive to metal.
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