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UVSystems OCT 2012 SPN


79


The success stories of UV installations all over the UK continues to spark off the phenomenal growth in a purification system which provides all the answers when it comes to completely safe swimming water


It’s a system which is reliable, cuts pool operating costs and most of all destroys chlorine- resistant microorganisms.


U


It is now a well-established method of swimming pool water treatment covering the whole range of pools from hydrotherapy pools, commercial and private pools to full-sized competition pools.


This growth in popularity has been largely due to UV’s reliability and ease of use. It works and doesn’t disappoint in its claims.


Another major factor is the reduced reliance on traditional chemical treatments it affords, particularly chlorine. UV is also highly effective at destroying chlorine-resistant microorganisms like cryptosporidium and giardia.


The cost of pool water is increasing, taking into account water costs, heating, chemicals and actual discharge costs, and is likely to rise. UV systems can cut chlorine usage and so the requirement for backwashing, dilution and shock


V water treatment provides the classic triple whammy when it comes to dealing with swimming pool water.


treatments is greatly reduced. Even pools with outdated dosing and filtration equipment can reduce their operational costs with a correctly installed UV treatment system.


So when over 100 years ago German scientists discovered that the top surface of lake-water was sterile when exposed to sunlight few could expect to see how that would have such long term implications for pool water cleanliness. Investigation of the lake water phenomenon led to the discovery of ultraviolet light and its many modern day applications. UV systems are proven to improve the swimming pool environment by improving water quality, air quality and safety. They not only provide disinfection against the 17 known chlorine-resistant micro-organisms such as cryptosporidium and giardia, which have a thick outer membrane making them highly resistant to traditional chlorine disinfection, UV also destroys chloramines. Chloramines are formed when free chlorine reacts with organics such as sweat, body fats and urine, brought into the pool environment by bathers.


The key point in the growing success story of UV in the treatment of all types and sizes of pools is the huge success rate.


Riverside Leisure Centre in Exeter was the first leisure centre in the UK to install a UV system to treat its pool water almost 20 years ago. The centre had just undergone a complete refurbishment and a Hanovia UV system was chosen to replace ozone following a period when only sodium hypochlorite was used. The system performed so well that when the time came for an upgrade in 2010, the centre didn’t think twice about replacing it with another Hanovia system. The upgrade was only necessary because parts for the old UV unit were no longer available.


One of the determining reasons behind the success of the ultra violet light systems is that once installed it has a high degree of reliability and success.


The UV systems offer the most comprehensive cleaning available and they are often used in pools where the owners are concerned about using large amounts of chlorine to clean the water. The popularity of the UV disinfection technique is due to the ease and efficiency in which it treats pool water. A constant rate of water treatment gives a more stable water purity level that is simpler to manage, with reduced chemical input. A correctly sized UV system can reduce the need for chlorine by up to 60%. A small quantity of chlorine (or bromine) is still required to give an in-pool residual treatment and to maintain clean pool surfaces.


Exeter’s Riverside centre was the first in the UK to install a UV system to treat its pool – almost 20 years ago


UV works by having already filtered water pumped into a chamber. When it flows through the chamber micro-organisms are exposed to and absorb powerful UV light. It is this light ‘energy’ that destroys or inactivates these ‘bugs’ once the water leaves the UV chamber and is returned to the pool.


By Alan Lewis


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