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74-79 ALLERGY FREE:SPN Master pages 15/09/2009 09:47 Page 5
spnfeature
‘We must have an
integrated approach’
Water treatment specialists Dryden Aqua call for more controls over the
types of chemicals being used in pool water treatment to prevent
incompatibility between different products
ny claim to have reduced 14 trillion with a collective weight
A
chlorine consumption in some over one hundred kilograms.
public pools by up to 90% is a “Bacteria will grow on
proud one. The success in any wetted surface such as
lowering the likelihood of allergies from sand, tiles or on the inside of
pools and making pool water safer is pipes. The bacteria stick
bound to win friends and grow business. themselves onto a surface by
Dryden Aqua is perhaps the only excreting alginate glue which forms a
biological company operating within the protective coat over the bacteria. When
swimming pool industry manufacturing you feel a slippy surface, this is the
filters, filter media and chemical products. alginate bacterial film not fats or
Says the company: ”If you remove all the grease. The colonies will still be
suspended solids and pollutants from invisible to the human eye or
solution, the chlorine consumption will fall they may make the water
to almost zero. Chlorine will still be required turbid or slightly cloudy.
to provide residual disinfection and some The conclusion is we
will be reduced by UV light, but noxious need to prevent bacteria
disinfection by products are not produced, from growing and the
or the problem has been minimised. It is most effective way to
then a small step to the next level, to achieve this task is to cut off
eliminate chlorine and bromine oxidising their food supply.
chemicals from pools altogether. Sand filters cannot remove
“Swimming pool water treatment dissolved organics from the water, achieve this task Dryden Aqua developed
systems use a wide variety of chemical and so the dissolved organics have to be APF (active poly floc) which has a much
mechanical products such as hypochlorite dragged out of solution by coagulation. wider spectrum than simple PAC.
and coagulants, filters and UVc units.The The coagulated particles are then Dryden Aqua developed and
quality of the products can be variable. increased in size by flocculation which manufactures AFM (active filter media) to
There should be an integrated approach to makes it possible for them to be removed replace sand in sand filters. So when you
the design of pool water treatment, and by the sand filter. The task is achieved by pass water through the filter that has been
control over the types of chemicals to injecting a flocculation chemical such as coagulated with APF any positive charged
prevent incompatibility between the PAC into the water at a point between the particles that are not physically removed
different products. pumps and the sand filters. The first by the filter bed will be adsorbed by the
“The primary function of the water problem is that not all PAC is the same, negative surface potential of AFM.
treatment system is to control water there are different levels of purity and
quality and prevent disease transmission contaminants, also PAC will only drag a
between the bathers. proportion of the organics out of solution.
DRYDEN AQUA
“Around 80% of the oxidation demands If the process is going to be effective,
( 01875 822222
: www.drydenaqua.com
on chlorine are from things in solution 100% of the organics must be removed. To
such as organic matter and nitrogen
compounds. Suspended solids are also
important but they only exert a small
“THE CONCLUSION IS THAT WE NEED
oxidation demand. The best that any
sand filter can do is to remove solids
TO PREVENT BACTERIA FROM
down to 15 microns, so it is impossible for
any sand filter to mechanically remove
GROWING AND THE MOST EFFECTIVE
dissolved organics. These dissolved
organics act as dinner for bacteria, indeed
WAY TO ACHIEVE THIS TASK, IS TO
one bacterium can double in less than 30
minutes, so after 24 hours you could have
CUT OFF THEIR FOOD SUPPLY”
Visit our website at www.swimmingpoolnews.co.uk >>> October 09 Swimming Pool News 67
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