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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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GROUNDWATER
AND TEMPERATURE
The
temperature of water from wells is remarkably constant. In wells that
are from 30 to 60 feet deep, water temperature
is 2° to 3°F above the annual
mean temperature of the locality. Water decreases in temperature about
1°F for each 64 feet of depth
to the well.
In
general, deep wells extend down through an impervious layer to reach an
underlying supply. Shallow wells, in contrast, are sunk in easily penetrated
strata to a point where they are below the water table. In terms of depth,
deep wells are classified as those extending below 25 feet; those going
less than this are considered shallow wells. Actually, deep wells vary
from 100 to 3,000 feet. The vast majority are in the 100 to 1,000 foot
range. Deep well water usually shows but slight change in composition
over a long period of time. In one study of some wells in Florida over
a 24 year period, hardness ranged from a high of 342 to
a low of 304 parts per million.
Alkalinity went from a high of 168 to
a low of 148.
Springs
provide another source of ground water. It is a popular belief that spring
waters are clear, colorless, sparkling and absolutely pure. While these
facts hold true for many springs, others show a marked degree of turbidity,
especially after a heavy rainfall.
Spring
waters further contain rather large amounts of dissolved mineral matter
and are hard. On the score of potability, no spring water should be considered
safe to drink unless it is given periodic bacterial examination.
Other
ground waters could also include mine waters and connate waters. Large
quantities of water are found in many mines and must be removed by pumping.
In some cases mine waters are no different than other ground supplies.
Generally, however, they have a high sulfuric acid and iron content. As
a result they may be extremely corrosive. Connate water or oil field brines
are the remains of ancient seas in which sedimentary rock
was at one time deposited. These "fossil waters," as they are
sometimes called, are generally highly saline. In the operation of oil
fields they have only nuisance value and present serious disposal problems
when brought to the surface.
While groundwater supplies
have definite advantages, they also present problems. Important disadvantages
are:
1. The presence of hardness
mineral compounds in larger amounts than in the
surface waters of the same
locality as a rule.
2. Iron and manganese
are present in many well supplies.
3.
Hydrogen sulfide is sometimes present.
4. The
cost of pumping well water is usually greater than that for pumping surface
water.
5. The
mineral content of several wells may differ widely even though located
close to each other.
6.
The supply may be uncertain.
7.
They may contain nitrate or detergent contamination. The presence of nitrates
or detergents in a groundwater supply can indicate pollution from sewage.
Healthy and Convenient!
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