A Buying Guide
House Water Filters
I would suggest that you never
buy house water filters from a department store or a
dealer. Most of those salesmen can't even answer your
kids when they ask, "How do water filters work, anyway?"
You're paying their commission and the store mark-up and you're
not getting reliable information.
In order to help you save
money and time, but still get the right system for your home,
I've put together a brief review of the most popular house
water filters on the market. These are the
the information is correct for the company's other models,
How Do Water
Filtration Systems Work: Brita & PUR
Brita is a subsidiary of the
Clorox bleach company, so I guess they know a little bit about
how to reduce chlorine. Their pitchers and their faucet
filter contain granular activated carbon or GAC.
GAC works to reduce chlorine
by trapping the chemical on its surface. If the granules
are not tightly packed, the water can channel through the gaps
without being cleaned. That's why the pitchers only
reduce the chlorine content by about 75%. PUR uses the
same design and has the same drawbacks.
The Brita faucet filter
removes more chemicals than the PUR system. But, neither
brand includes a step to remove chlorine byproducts (THMs) or
harmful VOCs. You need an adsorptive block to remove
How Do Home Water
Filters Work: Adsorption
House water filters that
include adsorption include a carbon and multi-media block, with
a micron sized porous structure. There is no way for the
water to channel around the block, so you can be assured that
everything is cleaned.
Purifiers that use this kind
of technology also trap contaminants on the surface and act
like a sieve to remove sediments and parasitic cysts.
They are similar to the older reverse osmosis technology,
except that RO would not remove chemicals. They also cost
less than RO and are just as effective at removing
The only contaminants that
would not be removed by this design are heavy metals like
lead. You need ion exchange to do that.
How Do Water Filters
Work: Ion Exchange
House water filters that
include an ion exchange step are truly "state of the
art". Tiny microscopic sized particles of lead carry
either a positive or a negative electrical charge. The
systems work with a kind of static electricity that attracts
the metallic particles and replaces them with potassium or
sodium, minerals that are good for your health and improve the
How do water filters work that
include ion exchange and an adsorptive block with a submicron
porous structure made of carbon and other filtering
media? The answer is; they work excellently. Your
water's current pressure causes it to "squeeze" together and
pass through all of these stages removing chlorine, THMs, VOCs,
lead, cysts and many other chemical contaminants.
You can buy
filters on-line, direct from the
manufacturer and save money, as well as time. Skip the
sales pitches and enjoy good tasting healthy water.
That's my advice.
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