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human body is approximately 70% water and needs to replenish water
lost in daily activity. Another important function of water is
to flush out toxins from the body.
is not a source of minerals for the body. A common misconception
is that hard water - water high in calcium, magnesium or iron
- is good for us. First, the calcium in hard water is inorganic
- a mineral from the earth. This is very different from calcium
of organic sources such as milk, vegetables and fruits. Secondly,
the kidneys and liver filter out impurities in fluids we consume.
Therefore, the purer the water we drink, the better, since our
organs have to do less filtering before our body uses the water.
is the difference between the two common forms of purified water,
reverse osmosis and distilled?
osmosis is a purification technique originally used to remove
salt from seawater. The technology has been modified to pass water
under pressure over a tightly wound thin membrane. As the water
passes over the membrane, small droplets of water form on the
treated side of the film, leaving the minerals to continue to
pass down the drain. This happens very slowly and several times
before the water treatment is finished. The removal rate for most
minerals usually ranges from 90-97%. When the membrane starts
to deteriorate reducing the removal rate to only 75% of the minerals,
it should be replaced - typically every 3-5 years. Note: Uranium,
arsenic, and lead have lower removal rates. If you have any concerns,
please have your water assessed.
is a well-known purification technique. Water is added to a boiling
chamber and heated to the boiling point. As the steam rises, it
is passed through a cold condensing coil to return the water vapor
to a liquid. The final step is passing the water through a carbon
filter before collection in a storage container. The water turns
to vapor and contaminates remain in the boiling chamber. Distillation
is probably the most expensive form of water purification due
to the power required to boil the water. However, it provides
the purest form of water with an impurity removal rate of over
Stephen Slauenwhite, CWQA Certified water technician can be reached
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