we have had our well water here test positive for coliform bacteria more
then once so we decided to have a whole-house ultraviolet water purification
system installed by Rainsoft.. This was after i heard all the bad things
about rainsoft.. I honestly think all these water purification installers
are crooks.. The guy had to come back to my house 3 times because the pipes
were still leaking.. I asked the guy about his past and he said he never
even went to school to learn this.. What kind of friggin people are these
But i would like to know is this system really effective in killing all the
bacteria in the water? The water seems to move through it pretty fast..
Also, i was doing a google search on this and a science teacher brought up
the fact that this type of ultraviolet on water could possibly cause cancer
in humans.. Is there any proof of this? I was pretty piszed when i read
about that.. Our government will probably tell us 20 years from now that it
I am no expert on the ultraviolet method of water purification, but have
never heard about the cancer causing aspects of it. I tend to ignore a lot
of the cancer scares we get in today's media. If you feed rats enough honey
or any other benign food, I am sure that some of the rats would develop
cancer of some other abnormality. But, would they have developed it anyway,
even without the honey? Who knows? Every week there is some sensational
report that says eggs, or something else are bad for you and then within six
months, there is another report that eggs or whatever are good for you and
we should eat more of them. Large Cities are using ultraviolet to purify
drinking water more and more these days, so one would think that it has been
investigated pretty good for it's effectiveness.
There are none, as it's the UV that causes (skin) cancer.
If the unit is competantly installed (a blueish glow visible anywhere
is bad news) there should not be any risk.
There is certainly no risk when it comes out of the taps.
The way to rate UV systems is how long the water is exposed to the UV,
and how intense it is.
This is measured in units like s * mw/cm^2.
Exposing stuff to UV for ten times as long is as good as ten times
the power for a tenth of the time.
Various stuff requires different amounts of UV to kill it.
The hardest stuff to kill is generally spores.
http://inquisitor.i.am/ | mailto: firstname.lastname@example.org | Ian Stirling.
As you found out...you have a bad installer...it happens. Bad thing is, you
paid for his training.
The UV-C band units I sell, have an 80% FIRST pass kill rate and thats with
air, moving more in volume, and in not as tight an enviroment as the UV
system you have for your water...so...I would say, they are VERY effective.
None I can find, and in fact, the opposite.
In fact, (granted, its from a company that sells the units, but you know,
that info now has to come from a 3rd party, in this case, a local college)
having a UV system on every unit I install (AC) and 2 units in my home, it
makes even more sense to install one for the water too..I would not worry
one bit about it...
Sheesh...depending on where you live, the very air you breathe is causing
SOMETHING to go wrong..
The UV generated by your water purification unit is what's called short
wavelength or germicidal UV and it's very fast and effective at killing
viruses, bacteria and other nasties. If the unit is sized for your water
system and operating properly, it will work and the manufacturer's
literature or web site should tell you if you have the right unit for your
application. To be absolutely sure, sample the incoming and output water
and have it tested.
Short wavelength UV can damage skin and eyes so you should not expose
yourself to UV radiation from the lamp. An automatic shut-off switch is
usually part of the unit so the UV lamp will not operate if the unit is
open. The purification device should also have safety glass in the
inspection port so the UV is kept inside the unit. Usually, some visible
blue light can be seen through the glass, but the harmful UV is filtered
Short wavelength UV is associated with skin cancer. If you expose your skin
to the UV from sunshine or certain electric light sources over time and
particularly if you have had severe sunburns when you were young, your
chances of skin cancer go up. But your UV water purification unit does not
expose you to UV and nothing is done to the water as it goes through the
unit that would make the water cause cancer.
Good post. I would also like to point out that the short wave UV is also
good at chemically altering the glass of the lamp itself causing the sort
wave emission to be reduced over time rendering the lamp ineffective at
killing the baddies even though lamp appears to be operating normally. You
should replace the tube periodically even though it has not burned out. The
guys over in sci.engr.lighting probably can explain this better.
Crooks because of poor plumbing skills leading to water leaks in
plumbing they did to install the light! I'd say it was due to their
pricing but... You ask questions about their hiring practices after
reading about them and buying from them after that anyway! ummmm
UV is one of the best means to treat for bacteria but it depends on a
number of things as to how well UV works in a given application. Things
like if the water needs pretreatment and you have it and maintain the
equipment to allow the light to work as it should. Also, you have to
replace the bulb in the time frame for the make of light you have.
That's usually 9000 hours (annually due to the intensity falling off due
to changes in the quartz the lamp is made of etc.) for all lights that
do not have an intensity meter or metering circuitry; which is finally
becoming popular with more and more dealers. I've been selling them
since 1994/19955. And it depends on the class of the light you have; A
or B with A being the only type I'll sell. The A lamp produces much more
intense UV-C than the class B lights. Like 40K to 16K
microwatts/centimeter squared when they are new, or the newest
terminalogy, microjoules/cm2. And then there's the proper flow control
to maintain the light's rated flow. So what light and any pretreatment
do you have or need based on the raw water quality you have?
No, the teacher isn't explaining things correctly or is mistaken. UV for
water is in the germicidal range of the UV spectrum; exactly it's 254.7
nanometers which is shortwave UV-C. If the light shines on you or in
your eyes that's dangerous but then the light would be in a bad way and
won't be treating your water anyway. If you have a viewport, the light
emitted from it does not contain the invisible UV-C due to it being
'filtered' out by the material the veiwport is made of; which is usually
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