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Did
you know?
Reverse osmosis is the finest water filtration method known. This process will
allow the removal of particles as small as ions from a solution. It is used
to purify water and remove salts and other impurities in order to improve the
color, taste or properties of the fluid. R.O. uses a membrane that is semi-permeable,
allowing the fluid that is being purified to pass through it, while rejecting
other ions and contaminants from passing.
This technology uses a process
known as crossflow to allow the r.o. membrane to continually clean itself. This
is the reason of why an r.o. element can last many years before clogging or
need replacement. This
water purification process requires a driving force to push the fluid through
the membrane, and the most common force is household water pressure or pressure
from a booster pump. The higher the pressure, the larger the driving force and
efficiency.
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METEORIC WATER AND
WATER CYCLE
When
millions of vapor particles unite, they form droplets of moisture. As
these increase in size, they finally become heavy enough to fall to earth
as precipitation in such varied forms as rain, snow, sleet, hail and dew.
Meteoric
water. A term applied to all moisture precipitating from the atmosphere.
Depending on conditions, it may fall as rain, snow, sleet or hail.
It is estimated that 16 million tons of precipitation in
any of these forms falls earthward each second. Through the process of
evaporation it is then drawn back into the atmosphere. In nature's balanced
operations, evaporation equals precipitation.
As water falls to earth in this never-ceasing moisture circulating system,
it serves to cleanse both the air and the ground. No doubt you have many
times noted the fresh, clean smell of the air after a heavy rain. This
is because the rain has absorbed suspended solid matter (dust, dirt and
soot), gases, odors and other impurities, polluting the air over the area.
While precipitation may remove large quantities of impurities, it never
succeeds in wholly eliminating them.
When precipitation continues for some time, the first amounts
to fall are apt to contain a great deal more suspended particles and dissolved
solids than that which falls later. An analysis of the mineral content
of rainwater in a large city after four hours of precipitation and again
after 22 hours shows the following variations (expressed as parts per
million as calcium carbonate):
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After 4 hours
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After 22 hours
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Hardness
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43
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8
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Calcium
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42
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8
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Magnesium
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1
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-
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Sodium
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11
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-
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NH,
(Ammonia)
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3
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5
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Bicarbonate
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19
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5
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Chloride
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10
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5
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Sulfate
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27
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3
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Nitrate
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1
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-
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As you can see, even this sweeping of the atmosphere did
not remove all the dissolved solids in 22 hours of rainfall.
Of all forms of precipitation, the snow falling high in the mountains contains
the least amount of mineral content. This is due, however, to the smaller
amount of dust in the atmosphere at high altitudes. As a result, many
mountain streams deriving their water from high fallen snow have extremely
low dissolved mineral content.
Rainwater
is also saturated with dissolved air (about 20 to 29 milliliters per liter
from 60 ° to 32°F). The amount of free carbon dioxide in rain varies from
2 to 6 parts per million. Any amount of free carbon dioxide above 1 or
2 ppm comes not from the atmosphere itself, but from other sources such
as chimneys or industrial fumes. Rainwater also encounters sulfuric acid
from the gases in burning coal over cities. In addition, it may pick up
bacteria and the spores of microorganisms.
Milliliter. The milliliter is 1/1,000 of a liter.
Liter.
This term is a unit of volume, slightly larger than a quart. One U:S.
gallon is the equivalent of 3.785 liters.
How much water falls in a day in the United States? The
United States Geological Survey has estimated that approximately 4,300
billion gallons of water fall within the continental limits of this country
each day.
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