HELP! We have a pool that uses chlorine and two aquatic therapists have developed a sensitivity to it with severe skin outbreaks. What can we do?
ANSWER: Sorry you are having problems. Unfortunately, it can be an occupational
hazard of being an aquatic therapist especially if you spend more than
4 hours in the water a day.
Unfortunately, a halogen sensitivity, once developed, usually remains. So what does a chlorine allergy look like? For one, exposure to the same levels of chlorine will typically result in a similar response.
The best answer is to add a supplemental
disinfection system (such as ultraviolet light, or an ozone generator) to your pool. It can reduce the
amount of chloramines in your water dramatically. Also, it is now much cheaper than it used to be. It is possible to add an UV component to your system for under $5,000.
More info on how to reduce chlorine with supplemental systems (especially Tips #36,
#47, #54).
One last point. Everyone assumes that skin rashes are due to exposure to chlorine. Often times, it can be an improper pH that is causing the problem. First rule of thumb, check the pH religously. Human skin will not tolerate exposure to pH which is not at or near 7.3-7.4 for long.
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Rashes are a common complaint with both pool and spa users. Rashes may
be caused by a reaction to chemicals in the water or by a bacterial
infection. The first step in investigating rash outbreaks should be to
identify the cause. The simplest way to differentiate chemically- and
bacterially-induced rashes is the incubation period (onset longer than
12 hrs; probably not chemically induced).
Best Practices to Reduce Chemical Rashes
- Maintain the proper sanitizer level at all times – this not only
provides oxidation but also prevents bacterial growth, including
Pseudomonas aeruginosa that will cause bacterial rashes.
- Maintain proper pH and alkalinity – improper pH has been linked
to some irritant rashes.
- Use routine supplemental oxidation to reduce combined chloramines
and bromamines. Supplemental treatments include quick-dissolving
chlorine compounds (cal hypo, dichlor, granular trichlor, lithium hypo,
and bleach), non chlorine shock-oxidizers (monopersulfate), and ozone.
Supplemental oxidation is particularly important when using bromine
compounds (BCDMH, DBDMH or sodium bromide).
- In spas, routinely replace the water. There are several guides
available for this, including one from the APSP (visit APSP’s website
at http://apsp.org/54/index.aspx for a free download of APSP’s complete
Water Treatment Information Bulletins.)
- When the water appears cloudy or foamy, the facility should be
closed at once.
These all seem rather obvious. Yet in reported cases one or more of
these were not followed by the operator.
The single largest group reporting chemical rashes is hydrotherapists
(therapists providing therapy in aquatic settings). These individuals
are exposed to chlorine- or bromine-treated water up to ten hours per
week. The temperature and bather loading of these therapy pools
resembles hot tubs.
One Israeli study revealed that 45 percent of the
190 therapists surveyed developed skin disease after beginning work
(Lazarov, Nevo, Pardo, and Froom. 2005. Self-reported skin disease in
hydrotherapists working in swimming pools. Contact Dermatitis
53:327-331). The authors concluded that skin disease for
hydrotherapists is an occupational hazard resulting from cumulative
exposure.
So what is the exact cause of chemical rashes? We don’t know. The
published cases do not provide enough information on the treatment
system being used by the facility or chemistry discovered during the
incident investigation.
We do know that hypobromous acid (the active
portion in “bromine”) is a poor oxidizer when compared to hypochlorous
acid (the active portion in “free chlorine”). We also know that
hypobromous acid reacts with organic matter to form combined
bromamines, just as free chlorine does. And bromamines and chloramines
are known skin irritants.
A further complication is that there is no
readily available test to determine the concentration of combined
bromamines. OTO and DPD kits measure only total bromine, which includes
the free bromine and combined bromine.
Excerpted from: The Association of Pool and Spa Professionals.
Chemically-induced Rashes. Recreational Water Quality. (A Publication
of the APSP Recreational Water Quality Committee). Jan 2008. Available
at:
http://apsp.org/APSPRWQE-news/Jan16/rash.htm
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