UV Light
Selling
Disinfection to the Public
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Summary: Disinfection
should be considered a minimum level of treatment for those relying
on private water supplies for their portable water needs. Oddly, it
often is not. Ultraviolet (UV) technology is one of the most
effective, convenient and affordable whole-house solutions for
effective disinfection. |
A few years ago, how many Canadians had heard of E. coli,
cryptosporidium or Giardia? Today, these waterborne bacteria
and parasites are almost as well known as polio, typhoid, cholera and
hepatities were to an earlier generation. Waterborne microorganisms can
cause serious illness if they contaminate our drinking water.
The recent contaminated drinking water tragedies in Walkerton, Ontario,
and North Battleford, Saskatchewan as well as similar outbreaks in other
areas of the world have taught many of us not to take the purity of our
drinking water for granted. This is especially true for those who don't
have access to a municipal water treatment system for their daily water
needs.
Convinced of the need to assure the safety of their drinking water,
customers want to know what options are available. One extremely
appropriate treatment method is the use of an ultraviolet (UV)
disinfection system. Water treatment dealers, however, may want to help
customers feel confident about their eventual decision (and about the
dealer's professionalism and honesty) by explaining the advantages and
disadvantages of the various options, which include drinking bottled
water, chlorinators, ozonators, filters, distillers and boiling the
water.
There are many criteria by criteria by which to evaluate the possible
solutions. Many are standard for any purchasing decision effectiveness,
cost and convenience, among others. One criterion sometimes overlooked
is whether or not each option represents a whole-house solution. Too
often, people only focus on their drinking water with undersink options.
Yet, it's important to disinfect all the water used in the home- water
for bathing, brushing your teeth, washing dishes cooking and other
purposes.
UV disinfection
UV
disinfection has been used in water treatment since the late 1970s and
is a cost effective, reliable way to kill virtually all waterborne
microorganisms. To disinfect water, UV systems use a specialized lamp.
It's convenient, environmentally friendly and provides a whole-house
solution for all residential needs -- drinking water, personal hygiene,
cooking and other uses. The taste of water isn't affected, and there are
no harmful by-products created. Maintenance generally requires only an
annual lamp replacement and sleeve cleaning.
Bottle Water
Bottled
water is not a treatment option but rather an option to treatment, in
that some people consider buying it an acceptable way of dealing with
bad or suspect water. It's convenient in some ways and not in others.
Bottles can be purchased at any local grocer; however, they must be
carted home and eventually recycled. Bottled water is, of course, often
delivered. The two most important reasons why people on private water
supplies concerned about safety might choose bottled water are ease of
decision-making (no need to learn about equipment), and a low initial
investment. While the low upfront cost of bottled water is an important
driver, the cumulative cost can be high. Indeed, Americans spent almost
$6.5 billion on bottled water in 2001, according to Beverages Marketing
Corp.'s recent report, Bottled Water in the U.S. Finally, bottled water
isn't a whole-house solution, though some people have been known to put
bottled water in every room of the house.
Chlorinators
Chlorinators add chlorine to water stored in a tank, allowing sufficient
contact time to kill harmful microorganisms. These systems require
regular purchase and handling of chemicals, and they can be prone to
maintenance issues. Chlorine is effective against most bacteria and
viruses, but not against Cryptosporidium. This is an important
consideration since it was this parasite that recently caused widespread
illness amount 14,000 people in North Battleford, Saskatchewan, and the
death of 104 people in Milwaukee in 1993. It also is susceptible to
certain potentially cancer-causing disinfection by-products (DBPs) in
waters containing organics, notably trihalomethanes (THMs) and
haloacetic acids (HAAs).
Ozonators
Ozonation like UV is a very effective disinfectant. Ozone can be
problematic, however, because while it has a short half-life, it can be
a volatile chemical and should be closely monitored. Most often it's
used in municipal and commercial/industrial applications, although a few
practical residential systems have been developed. Like chlorine, it
also has a DBP-bromate-in waters containing the bromide ion.
Filters
Filters vary
widely in cost and performance. Most aren't very expensive and are easy
to install, but they aren't effective against many waterborne
microorganisms. These filters are meant to remove sediment, taste and
odor from the water. They may remove pathogens, although they aren't
designed to remove sufficient numbers of them (typically a 99.99 percent
or 4-log reduction is sought with any disinfection system). Filters may
also treat water for the entire household.
At
the extreme of filter performance are reverse osmosis (RO) purification
systems, which are typically practical for point-of-use only given their
high cost. Still, RO systems aren't immune to bacterial grow through and
may require a post-treatment disinfection system fro those with weakened
immune systems. Some manufacturers offer such a system as part of their
product. Though maintenance is simple, pre and post-filters require
regular replacement and membranes should be replace every two to four
years.
Distillers
Distillers represent a way of boiling water and removing unwanted
contaminants more efficiently and conveniently than you can in a pot on
the stove. They are nonetheless energy intensive, and don't provide
water that's immediately consumable (i.e., cold). They aren't a
whole-house solution.
Boiling water
Boiling water is an option with almost no upfront cost,
though the energy use does add up. More importantly, boiling water is
very labor intensive and inconvenient in that it doesn't produce
immediately consumable water. It can also concentrate rather that remove
some volatile contaminants. Like distillers, boiling water isn't a
whole-house solution.
Opportunities everywhere
Consumer awareness is increasing. The number of water tests
performed is growing, and there are more and more people taking
preventative measures. Still, consumer behavior sometimes needs
encouragement. It's not that people don't care enough for their
families. The flaws in their knowledge or reasoning must simply be
addressed. They must understand the dangers and realize that, without
proactive measures, their safety may not be assured. This doesn't
necessarily need to be done through a sales pitch that focuses on fear
-- but rather one that stresses the positive health benefits of treated
water. One should keep in mind also that combining technologies
mentioned above offers a more pragmatic, multi-barrier solution to water
treatment that any one individually. And adding UV to the mix offers
even more assurance. In fact, UV (like RO) typically includes
pre-filtration(UV301~501), making the
complete package a multi-barrier solution.
Conclusion
In the end, every customer on a private water supply should take
steps to assure their supply is safe at all times. Many of these
customers are already in the marketplace, buying filters, softeners,
salt, pumps and other pieces of equipment and supplies. A well-trained
representative should be able to succinctly deliver the message that
there is reason for concern and that reacting to an incident after the
fact isn't worth the risk, especially given the affordability and
convenience of some available options. In many ways, the most effective,
convenient and affordable of these disinfection options is a UV system.
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