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Water Filtration Facts
When considering the benefits of home water filtration products over tap
& bottled water, first keep in mind that there are no bad systems... any
water filter is better than no filter.
The choice to be made is simply which product produces the healthiest
water and represents the best value. Quality home water filtration can offer
significantly better water than tap or bottled water at a fraction of the cost.
Determining the best system is a simple matter of comparing the product's
performance to other alternatives. The performance of a particular water
filtration system can be easily verified by reviewing it‘s Performance Data
Sheet which lists all the contaminants the system is certified to remove and to
what degree. The law in California and several other states requires that this
information be included as part of the company‘s literature as well as the
ongoing replacement cartridge cost‚ and that a copy be enclosed with each
product. Typically this information will be available on a manufacturers web
site unless they are not too proud of it. Some manufacturers do not make this
information readily available as it allows an easy comparison with other
legitimate products. (see "Documentation" option under
"Products" tab on our home page)
By comparing each products contaminant reduction capabilities‚ system cost
and ongoing cost per gallon‚ it is easy to determine which product best fits
your needs.
It is also important to look at the advantages or disadvantages of other
products or technologies even though they are not leading brands; such is the
case with reverse osmosis and distillation systems. Although none of the
leading brands employ either of these de-mineralizing techniques‚ as their
popularity has declined in recent years‚ there is an ongoing debate over the
healthfulness of de-mineralized water vs. filtered water‚ with minerals. While
there are studies that argue both sides of this debate‚ after 15 years of
specialized study in water quality and health‚ we feel that the benefits of
drinking naturally balanced water with minerals vs. de-mineralized water‚ just
makes more sense.
From a non-scientific perspective‚ the simple fact that nowhere on this
planet do we find naturally occurring de-mineralized water‚ should tell us that
we were not meant to have it. In nature all fresh water contains traces of
natural minerals like calcium‚ magnesium and potassium‚ which is what our body
was designed to run on and what the Aquasana system produces.
On a more scientific level‚ there are several very credible research reports
and books that stress the more recent opinion that long term consumption of
de-mineralized water can in fact be dangerous. Dr. Zolton Rona‚ author of The
Joy of Health‚ states that "the longer one consumes distilled water‚
the more likely the development of mineral deficiencies and an acid
state." Dr. Paavo Airola‚ cancer expert and author of "How to Get
Well" and "Cancer... Causes‚ Prevention and Healing" also
reports that "long term consumption of distilled water eventually results
in multiple mineral deficiencies."
Two very negative things happen when we consume water that has been stripped
of its natural minerals. First‚ because de-mineralized water contains more
hydrogen it is an acid with a pH below seven. Any time we consume an acid
substance our body will pull minerals from our teeth and bones to produce
bicarbonate in order to neutralize the acid. Second‚ it has been proven that
when our body fluids become more acid than alkaline the production of free
radicals increases‚ causing increased cancer risks. Many studies suggest that
cancer cells can only grow in an acid environment. This theory seems to be supported
by the fact that around the world the areas where people live the longest most
disease free lives are the areas that have the most alkaline water‚ water with
the highest mineral content.
Reverse Osmosis and Distillation were first developed over 40 years ago for
the printing and photo processing industries‚ which require mineral free water.
Because of the popularity and demand for home water treatment products many
companies have marketed these products as "state-of-the-art" drinking
water systems‚ which they simply are not. Often these products are marketed by
using a demonstration that measures the TDS (total dissolved solids) and
implies that this measurement shows the systems effectiveness at removing
contaminants. TDS meters measure the dissolved minerals in water‚ primarily
calcium and magnesium‚ and have little or nothing to do with contaminant
levels.
Distillation and reverse Osmosis are not very effective at
removing synthetic chemicals. Distillation removes things based on their
relative boiling point. Virtually all synthetic chemicals boil at a lower
temperature than water and therefore are vaporized and condensed along with the
water in a distillation process. Reverse Osmosis removes things based on
molecular size. Virtually all synthetic chemicals are molecularly smaller than
water and therefore cannot be effectively removed by reverse osmosis..
The following paragraphs give a basic description of how each of these
systems work and it‘s relative comparison to the patented Aquasana multi-stage
filtration process.
Point-Of-Use Distillation
This process passes water over a heated coil‚ causing the water to vaporize and
become gaseous. The steam then rises and transfers to a cooling chamber‚ where
it condenses back into a liquid. This process separates water from inorganic
compounds like lead‚ calcium‚ magnesium‚ etc. Distillation also destroys
bacteria. This process is not very effective at removing organic chemicals
since they typically vaporize at a lower temperature than water and are
transferred in the steam. A distiller should always be used in conjunction with
a carbon filter. Distillers produce water at a very slow rate and at a
per-gallon cost of 20 to 26 cents a gal.
Reverse Osmosis‚ R.O.
This is a process that exposes water under pressure‚ to a semi-permeable
membrane with a very fine pore structure. Because most inorganic contaminants
are of a larger molecular size than water‚ the membrane rejects certain
contaminants‚ minerals and a large part of the water. The portion of water that
passes through the membrane is stripped of inorganic compounds and trace
minerals. Because many synthetic chemicals like herbicides and pesticides are
smaller‚ molecularly‚ than water... an R.O. system must also be used in
conjunction with a carbon filter. R.O. systems require adequate water pressure
and extensive maintenance. Because most point-of-use R.O. systems produce less
than 1 gal. per hour‚ they require a diaphragmed storage tank. Reverse osmosis
typically wastes 2 to 3 gallons of water for every gallon it produces and has
an 18 to 24 cents per gallon usage cost.
Pitchers and Carafe Style Filters
In recent years these types of filters have emerged as low cost alternatives to
tap water and bottled water. Keeping in mind that any filter is better than no
filter‚ these products are by far the least effective and the most costly to
use. Pitchers and carafe filters are sold on the "Polaroid
principal"... sell the camera cheap and make it up on the film sales. The
result is the same with these pour through pitcher filters‚ lower quality at a
higher price. The average pitcher filter sells for around $25 and includes one
30 gallon filter cartridge. Because of the small size of these cartridges they
have a very limited level of effectiveness and a low capacity. While
pour-through filters do offer a slightly improved alternative to tap water‚
they by no means can offer the quality‚ convenience and economy of the Aquasana
System.
Carbon Block And Granular Carbon Filters
These are the most common style of countertop and under the sink systems (POU‚
point of use). Granular carbon filters and carbon block systems basically
perform using the same process of contaminant removal‚ adsorption‚ which is the
chemical or physical bond of a contaminant to the surface of the filter media.
Activated carbon‚ is recognized by the U.S. EPA as the best available
technology for filtering VOCs and THMs.
Multi-media block filters‚ like the Aquasana System‚ utilize the benefits of
activated carbon with several added advantages. A blended media is extruded or
compressed into a solid form with a sub-micron pore structure to filter out
sediment and cysts... like Cryptosporidium and Giardia. This configuration also
prevents water from channeling around the filter media.
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It is essential for the best performance to be achieved that a multi stage
process be used in order to filter out a wide range of contaminants.
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