For swimming pools, you mean? Advantages are convenience (not hauling
chlorine) and stable quality (automatic dosing). Cost is about a wash,
when you consider the true costs of investment, depreciation and
electric power. Disadvantages are a complex gadget with risk of non-
performance or failure, stray electric currents in pool if unit not
installed properly or pool is improperly bonded/grounded, electrolytic
damage to stainless steel lights/ladders/etc, corrosion of other
hardware above the water (bolts on a diving board or slide, etc),
ruining concrete/grout/stone with salt damage especially in a freezing
Chlorine does not irritate eyes in pool concentrations. Low pH or
chloramine are way, way more irritating. Eye complaints are almost
always due to pH, not chlorine, sometimes other contaminants.
Chlorine also does not turn hair green.
Do not be a sucker for superstitions about chlorine. These ideas are
promoted by (1) people trying to sell you non-chlorine products and (2)
neurotics who find some invisible cause for every discomfort in life.
Another piece of nonsense from the world's foremost usenet contrarian, Richard
Chlorine can cause hair to turn green. That's because many, many people have
artificially colored hair. Chlorine can absolutely turn your hair green.
Kinch is a nut job, who doesn't know how to think things through.
Awww, cut him some slack, willya? He's not from around here. Chemistry works a
little different on his home planet, that's all. Where he comes from, gasoline
is safe to drink and carbon monoxide is safe to breathe, but common household
borax is a deadly poison. And all petroleum distillates are the same.
Electricity works differently on his homeworld, too, where there's no
difference between a parallel circuit and a dead short. He just hasn't had
enough time to get adjusted to the differences between his home planet and
this one. Give him a break.
Doug Miller (alphageek at milmac dot com)
Ah, now comes Miller, my Usenet stalker, pouting about my trenchant myth-
busting. Persisting in a futile obfuscation of email@example.com like
an aborigine frightened by his own photograph.
My worthless scribbles are somehow worthy of his meticulous inventory, and
he takes it as his duty to hork up and spit his top-ten bile-wads into yet
another redundant post now and then.
If one can't inform, then one ought to at least entertain. Or keep quiet.
Republishing old quarrels is boring. Excitement over such things is an
I've seen plenty of blonde kids (no "artificially colored hair") with
green hair from a SWIMMING POOL or SPA, but not from CHLORINE. I have
observed this in pools or spas I know to have copper added, with various
concentrations of chlorine down to ZERO. Morever, I have observed those
same kids in pools I know to have *no* copper but lots of chlorine, and
never found any trace of green.
I defy you to produce a chemical reaction of hair protein plus chlorine
equals anything green.
When hair turns green from a swimming pool, it is because of a COPPER
compound likely added as an algaecide, most commonly copper sulfate.
Not chlorine. Typically concentrated in the tips of hair by gravity
during drying, the concentration being too slight to otherwise produce a
You also see this effect in fingernails. You won't typically see it in
That's a bit of definitional retreat, from hair itself to hair dyes.
Nevertheless, of the variety of cases I've seen, it has nothing to do with
dyed hair, and everything to do with fair-haired kids, or older specimens
salon-bleaching their hair artificially blonde. Something in the pool
water is added to their fair hair, not taken away, to produce the green,
that something being copper. Tip concentration exaggerates the effect.
The few ppm of chlorine as in swimming pools does not bleach. It it were,
normal bathing in city water (which used to be sanitized with a ppm or two
of free chlorine, but nowadays almost all chloramine instead) would have
been bleaching everybody's hair dyes, and that certainly wasn't the case.
Yes. Maybe if you read some of those hits you'd know what it is, such as
this one in the top 10:
"Chlorine Blamed for Turning Hair Green"
Salt's not going to kill harmful microrganisms unless maybe if you get up to
the concentration of salt in the Dead Sea.
I believe the ocean and blood contain ~5% salt and we all know stuff can
live there. Chloride ion has no oxidative power to kill bugs.
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