SPN FEB 2010 COMPLETE EDITION:SPN 2010 21/01/2010 06:29 Page 69
www.swimmingpoolnews.co.uk UVSystems FEB 2010 SPN 69
make 2010 an even bigger year
for its approval.
Virtually no microorganisms
are immune to UV, even chlorine-
resistant pathogens. Another
major benefit of UV is that it
significantly reduces the need for
backwashing and dilution, saving
hundreds of pounds a month for
pool operators.
Although the need for chlorine
is greatly reduced with UV, small
amounts are still needed to ensure
residual disinfection. Chloramines
are formed when free chlorine
reacts with sweat or urine in pool
water. Trichloramines in particular
are powerful irritants which are
responsible for eye and respiratory
complaints and the unpleasant
‘chlorine smell’ commonly
associated with indoor pools.
Chloramines are also corrosive and
in time can lead to damage to
pool buildings and structures such
as ventilation ducts.
CASE STUDY
Specialists atg UV Technology
‘POOL USERS HAVE REALLY NOTICED
believes the industry leap
forward to UV is driven by public
AND COMMENTED ON THE
demand for improved bathing
environments and increased IMPROVED POOL ATMOSPHERE’
education and understanding on
the benefit of a UV system. Two indoor swimming pools at the Royal Russell School in Surrey, one
atg UV have warranted their of Britain’s most prestigious independent schools, has seen a dramatic
success in the leisure market to improvement in both water and air quality – thanks to UV systems.
their breakthrough ECF system There has also been a significant reduction in chemical usage.
range, designed and engineered As bather loads have been increasing year on year and eventually
specifically for the swimming and surpassed the pools’ original design load capacity, Pool Manager Bob
leisure industry, catering for spas Ellis felt that the water treatment system needed an upgrade. He
and diving pools to splash pads therefore opted for UV, not only because of the improved
and full scale water theme parks. disinfection it offers, but also because of its primary advantages: no
The ECF system allows leisure more ‘chlorine smell’ and sore eyes caused by chloramines, lower
operators to protect against running costs and easier operation. An additional advantage is that
harmful waterborne micro- UV can help lower TDS (Total Dissolved Solids) levels, which are
organisms such as e-coli and difficult to control with a ‘chemical only’ pool treatment system. UV
Legionella. Unlike traditional is also highly effective against Cryptosporidium, a microorganism
chemical treatment methods, the that is notoriously resistant to chlorine.
effectiveness of UV systems are UV is well known for reducing both TDS levels and chloramines also
not limited to certain micro- known as combined chlorines – the unpleasant chemicals formed when
organisms, and will provide an chlorine combines with the organic compounds deriving
effective barrier against all known from human use of the water. Chloramines are also very
bacteria, viruses and pathogenic corrosive to metal building structures. High TDS or
micro-organisms, including chloramine levels often also mean cloudy, murky water.
chlorine resistant organisms such “We always managed to keep chloramine levels
as Cryptosporidium. quite low (typically about 1.0ppm) even before we
Additionally, UV treatment is started using UV,” commented their engineering
also used to break down services manager. “Since UV was installed,
chloramines, resulting in a more however, chloramine levels are as low as 0.2ppm,
pleasant and inviting leisure which has significantly improved both water and
environment for customers, air quality. TDS levels have also halved since UV
reducing ‘Red Eye’, skin irritations was introduced, which means the water is now
and the often overpowering much clearer. Pool users have really noticed and
chlorine smell associated with commented on the improved pool atmosphere. In
indoor swimming facilities. The fact, it actually helps attract more customers.”
elimination of chloramines also Bob Ellis said: “The fact that we have all these
produces crystal clear, sparkling benefits without the staff having to interact
water, and vastly reduces the significantly with the Hanovia UV system is a major
need for taxing shock treatments advantage. They all have other duties, so knowing
and backwashes. that they can rely on the system to just work
“Bathers need to be kept safe,” effectively in the background has tangible value. Staff
says atg Technical Director Tony simply check the Hanovia system’s control panel once
Leigh, “and pool operators also a day and log the parameters to record usage and
want to make the experience as condition. Over the past 18 months we have needed
pleasant as possible, whilst to do nothing more.”
balancing the commercial needs
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