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Chemistry
Using resources
Water
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Cards (14)
All
humans
rely on
safe drinking water.
Salt
can be removed from
sea water
to make it
safe
to
drink.
Waste water
must be
treated
before being
released
into the
environment.
Potable
water is water that is
safe
for humans to
drink.
Potable
water is not
pure water
because it almost always contains
dissolved impurities.
For water to be potable, it must have sufficiently
low levels
of
dissolved salts.
Microbes
in water can cause
illnesses.
The methods used to make water potable depend on
where you live.
In the
UK
, rain provides enough
fresh water
to meet the needs of the
population.
During the summer months in some areas of the UK, water reserves run
low
and people are encouraged to conserve tap water by the use of
hosepipe bans.
Rainwater collects in
rivers
,
lakes
and in
rocks underground.
This water contains
low
levels of
dissolved substances.
Most potable water in the UK is produced from
naturally occurring fresh water
by passing the water through
filter beds
to remove
insoluble particles.
The methods used for sterilisation include
chlorine
,
ozone
and
ultraviolet light.
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