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80 DRYDEN EDIT:SPN Master pages 20/11/2009 11:33 Page 2
spnfeature
Pool products
certification is
essential says
Dryden Aqua
call has gone out for a full and regulation in the UK in accordance to The cloudiness or turbidity of the water
A
certification programme of pool acceptable standards to protect the pool may be caused by solids breaking
products and chemicals within installers as well as the public, and a good through un-stable filters due to transient
the specialist industry. template would be the German DIN worm-hole channelling. System instability
The call comes from Dr Howard Dryden standards.” can be caused by many factors, but most
of Aqua Dryden who in a ‘Life and the Dr Dryden says the swimming pool sand filters or filters containing poor
Environment’ paper says: “There are many industry is either non technical or is based quality media will be unstable. Little
good products manufactured in the UK but on a chemical or engineering perspective concern is expressed over slightly cloudy
sometimes the combination with other and has failed to factor in the biological pool water, as long as the chemistry is
products and chemicals can have really component of water treatment systems. okay and no bacteria can be detected.
dangerous side affects. “The primary role of a swimming pool However turbidity is usually due to a
“By way of example, some pool products water treatment system is to prevent the colloidal suspension of lipo-
contain surfactants, if the products are transmission of human pathogens and polysaccharide molecules with bits of
added to the water they destabilise the disease, this is a biological problem.“ bacterial cell walls or dead bacteria,
sand filters and the solids in the filter along He says the real concern are volatile there may also be other solids, oocycts
with bacteria and cryptosporidium oocysts lipid soluble chemicals including THM`s and flocculant chemicals present.
will be instantly discharged into the pool. such as chloroform, or chemicals including Chemicals excreted by bacteria or the
The only way to avoid these problems is to cyanogen chloride that are nerve toxins. remains of bacteria are exotoxic and
have proper certification of pool products “The lipid soluble nature of the gas endotoxic, and while they are non
and chemicals. means that they diffuse through the water pathogenic they can will cause an allergic
“Inevitably companies will try to copy surface into the air, and then readily pass response or a fever, and as such they are
products and procedures, but without the through lung tissue and enter your blood almost as dangerous as living bacteria.
knowledge or understanding the stream. Blood chloroform levels can increase Problems have been identified in the
consequences can often be dangerous. 50 fold in as short a time span as 10 minutes swimming pool industry, but little has been
AFM
®
is an activated filter media and one exposure to high levels of nerve done to correct the problems, especially in
manufactured under ISO9001-2008 toxins can result in long term neurological the UK, he adds.
procedures to the best European drinking problems and health related issues. “If you are aware of a problem then this
water standards. It is the opinion of Dryden Aqua that the gives the opportunity to either avoid or
“However some organisations are under acute and chronic toxicity of volatile lipid eliminate the problem, and if this can be
the impression that it is simply a crushed soluble chemicals have either not been achieved by reducing running costs,
glass product, and as such crushed glass is fully appreciated, or the authorities are not carbon foot print and chemical costs, it is a
now being supplied by some pool aware that a potential serious public health win:win situation. In order to achieve this
companies. We need product certification hazard actually exists. Dryden Aqua has developed an integrated
approach to water treatment using AFM
®
Active Filter Media, APF
®
Active Polyfloc,
“INEVITABLY COMPANIES WILL TRY TO
ZPM
®
Zeta Potential Mixers and NoPhos.
“The products work together to provide
COPY PRODUCTS AND PROCEDURES,
a system performance much greater than
the sum of the parts to eliminate more
BUT WITHOUT THE KNOWLEDGE OR
than 90% of the chlorine and oxidation by-
products. The Dryden Aqua system not
UNDERSTANDING THE CONSEQUENCES
only reduces chlorine demand but also the
oxidation demand of the water, which
CAN OFTEN BE DANGEROUS”
allows chlorine free products to work much
more effectively.” spn
80 Swimming Pool News December 09 Digital edition available at www.swimmingpoolnews.co.uk
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