SPN FEB 2010 COMPLETE EDITION:SPN 2010 21/01/2010 06:27 Page 66
66 SPN FEB 2010 WaterTreatment
www.swimmingpoolnews.co.uk
THE PERFECT FORMULA FOR
PERFECT POOL WATER?
LEADING ENVIRONMENTAL AND WATER TREATMENT EXPERTS DRYDEN
AQUA HAVE DEVISED A SYSTEM WHICH ALLOWS POOL OWNERS TO
QUANTIFY THE ONGOING PERFORMANCE OF WATER TREATMENT SYSTEMS
� AS THE POOL IS BEING USED. THE SYSTEM GOES UNDER THE NAME OF THE
DAP FACTOR AND IT�S A SYSTEM WHICH IMPORTANTLY ALSO REGISTERS
IF THERE�S ROOM FOR IMPROVEMENT IN WATER QUALITY
P
ublic swimming pools usually account for more than years do not have a fully
have to comply with 80% of all chlorine used. In a well developed blood-brain barrier
statutory water and air operated and designed pool, and they are most at risk from
quality requirements. chlorine consumption will be neurological damage arising
The trouble comes in knowing lower, and the chlorine by- from lipid soluble volatile
how a pool is actually products will be less toxic with a chlorine gas such as cyanogen
performing or to compare one higher percentage discharged as chloride and the THMs.
pool against another. coagulated suspended solids in UVC irradiation will improve
Dryden Aqua say its DAP Factor the back-wash water. Little water quality by reducing
is an approach that can be used chlorine is discharged in make-up chloramine concentrations, the
to quantify the performance of water used for dilution, if we same situation applies to outdoor
any pool water treatment assume a total chlorine pools, or pools exposed to strong
system. It is a tool to mitigate concentration of 1 mg/l in the sunlight. The chlorine component
the risk to the public, pool staff pool and discharge 30 litres per of the chloramine is not removed
and avoid structural damage, as bather, then the amount of water it is simply changed into a
well as a tool to help reduce discharged by 1,000 bathers will different form which includes
running costs and save money. equal 30 m�. The amount of volatile chlorinated chemicals that
The Edinburgh based specialist chlorine in 30 m� is only 30 g, gas-off through the water surface.
company says the system if used but a well managed pool will use Many of the chlorinated
correctly could save a typical around 1,500 g of chlorine per gaseous chemicals in the air do
public pool up to 50% of water day, so the amount of chlorine not have a smell so you may be
treatment costs. dumped in the make-up water is unaware that there is a problem.
only about 2 % of the total. The Nitrogen trichloride has a
�The system is based on a simple approach;
data confirms that most of the distinctive chlorine smell but the
chlorine used in a swimming other chemicals are a great deal
the less chlorine used per bather, the
pool will gas off as chlorine more toxic than nitrogen
reaction products through the trichloride and have no smell and
better the system performance�
water surface. are not actually monitored on a
While water quality is regular basis. The DAP system
important from a bio-hazard provides a tool that can be used
disease perspective, the key to evaluate any swimming pool,
The system is based on a factor is how much chlorine irrespective of the size or design
simple approach; the less chlorine actually used will reflect on the of the systems. It may be used to
used per bather, the better the air quality. Most chlorine will determine the potential risk
system performance. Since most end up as a gas such as nitrogen factor associated with the pool
of the chlorine added will gas off trichloride and discharged and used as a means of reducing
as a variety of chlorine by- through the water surface in a operational costs.
products, the running costs and poorly operated pool. It does not Data sheets to enable pool
safety of the system are directly matter if it is an indoor or an owners and managers to
related to the DAP Factor. out-door pool; you will still have calculate the available chlorine in
The two variables are: a high concentration of organic the product that you use in your
1 Average daily bather load and inorganic chlorinated gases swimming pool are available
2 Average daily consumption of at the water surface, unless there from Dryden Aqua. spn
chlorine is a wind blowing over the pool.
It is chlorinated gaseous
FOR FURTHER INFORMATION
In a poorly operated and chemicals that represent the
i
designed pool, most chlorine will greatest health risk to pool staff F DRYDEN AQUA LTD
be discharged as chlorine reacts and the public especially the ( 01875 822222
to the atmosphere and this will very young. Children under two :
www.drydenaqua.com
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