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Water - Solubility - Ions

Drinking Water.

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.

Tiny 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 bacteria.
Ultraviolet light can also be used to disinfect water.
Fluoride is sometimes added for dental health. The safe clear
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.

Pure water can only be produced by distillation.
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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