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Water - Solubility - Ions
Water 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 that 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.
Fluoride is sometimes added for dental health. The safe clear
water is then 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
their 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
This requires a lot of energy and is expensive. 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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