Water - Solubility - Ions
is made safe to drink by
removing solids and killing bacteria.
Solids are removed by
filtration and sedimentation.
Water is allowed to flow through stone and sand filter beds
to remove solid materials.
The sand becomes finer near to the bottom of the filter
to remove small solids.
particles which are still suspended in the water are allowed to
settle out and fall to the bottom. This is called sedimentation.
Chlorine (or ozone) is bubbled through the water to kill
Ultraviolet light can also be used to disinfect water.
The safe clear water is pumped through underground pipes to houses.
The quality of drinking
water is monitored by environmental agencies
for dissolved ions such as nitrate.
Some people use water filters in their homes
to make tap water nicer to drink.
Water filters may contain silver which has an anti-bacterial effect
and carbon which is good at removing tiny particles.
water can only be produced by
It is not good to drink distilled water because it
removes ions from the body which may lead to health problems.
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