64-65 UV:SPN Master pages 18/5/09 19:41 Page 2
spnfeature
Are UV systems set to
dominate the pool industry?
More pool operators and designers are set to adopt UV technology in
the bid to reduce exposure to potentially harmful chemicals. In an
exclusive extract from work with the World Aquatic Health Code, atg
UV’s Technical Director Tony Leigh looks in detail at the advancements
and future for ultraviolet disinfection for swimming pool applications
“UV technology has an important role to cost led pool operators to migrate towards The problem
play in the provision of safe, healthy water ozone systems, which promised much. “Bathers need to be kept safe, and pool
for recreational use. As more organisms Ozone remained a preferred technique for operators also want to make the
become tolerant and progressively several years, however high initial capital experience as pleasant as possible, whilst
resistant to chlorine, so operators and cost, coupled with ageing and complex balancing the commercial needs of their
designers will adopt this technology to plant requiring continuous attention led business. Traditionally chemicals such as
complement the use of conventional operators to re-examine UV light. chlorine have been added to pools to
halogens, and reduce bathers exposure to “The arrival of powerful medium provide effective disinfectants; this has
potentially harmful chemicals. pressure lamps, capable of treating a full worked well however organisms have
“Ultraviolet (UV) light has gained rapid recirculating flow, coupled with automated started to develop resistance to chlorine,
prominence as an effective disinfection wiping and lower overall operating costs and several outlined later in this article
technique. Early attempts to use UV had led to the replacement of ozone by cannot be killed using chlorine alone.
involved the combination of UV lamps and medium pressure UV systems. Today New developments in pool disinfection
Infra Red emitters; the UV was to disinfect several thousand pools use UV as a use electrolysis to form chlorine by
the organisms in the pool water and the IR method of disinfecting the “emerging” making the entire pool into a very low
emitters designed to destroy the chlorine resistant organisms, and concentration brine solution. This seems
combined chlorine species. effectively eliminating the combined to be a safer method of chlorinating the
“The lack of full flow capacity and high chlorine nuisance. pool, and is gaining acceptance.
“A SECONDARY ISSUE FOR THE POOL OPERATORS ARE
THE BY-PRODUCTS FORMED BY THE ADDITION OF
CHLORINE TO POOL WATER; COMBINED CHLORINE
SPECIES ARE IRRITANTS, CAUSE CORROSION AND ARE
INCREASINGLY LINKED BY MANY RESEARCH GROUPS TO
ASTHMA IN CHILDREN AND ELITE ATHLETES”
64 swimming pool news JUNE 09 Digital edition available at www.swimmingpoolnews.co.uk
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