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- Dryden Aqua principle
- "Chlorine is the best disinfectant that we have for swimming
pools, however any process, technology or operational procedure that
increases chlorine demand should not be permitted because the
concentration of toxic chlorine reaction products in the water
and air just above the surface of the water, is linked to
chlorine consumption". At Dryden Aqua we endeavour to
provide systems and develop technology that improves our environment
and minimises the use of chemicals.
Edinburgh
Leisure's, policy is to use AFM in all their Swimming Pools.
Edinburgh Leisure is a leading leisure trust with a turnover of £18
million, 630 employees and over 3.3 million customers a year. To help
these customers stay active they manage swimming pool leisure
facilities for the City of Edinburgh Council
What increases chlorine consumption ?
- 1. High water flow through filters, the optimum is less than 15
m/hr
- 2. UVc consumes chlorine (approx 200% increase) and
generates carcinogenic THMs
- 3. Ozone systems increase chlorine demand by up to 500%, a
small percentage of the extra
- chlorine is absorbed by the carbon filters,
but most of the extra chlorine forms volatile
- chlorine reaction products.
- 4. Any organic chemicals especially anionic surfactants should
not be permitted in the water
- 5. Bathers must shower before entering the pool
- 6. Sand, zeolites, activated carbon, anthracite or any high
surface area media that supports the
- growth of bacteria should not be permitted if
there is a better alternative.
- 7. Coagulation and flocculation must be used in all public pools.
- 8. Only DIN standard vertical filters to be used, horizontal
filters and non DIN standard filters
- should not be permitted in a public pool
If you use AFM in a DIN standard filtration
system at appropriate water flow rates (with NoPhos and coagulation
with APF) you will be able to
operate a public swimming pool with a free chlorine level of 0.5mg/l,
with a combined chlorine level consistently less than 0.2mg/l,
turbidity levels less than 0.01 NTU and there will be virtually no
trichloramines or trihalomethane. The chlorine and chemical demand
will drop by up to 90%, water demand will drop by 75%.
The atmospheric conditions will dramatically
improve, you will not only be protecting the public but the fabric of
the building and the air handling systems. AFM is a proprietary
product of Dryden Aqua however we also have a duty of care to the
public and it is essential that all of the facts are made public.
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Key Points
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AFM prevents Lung
damage. If your eyes sting when swimming, the chemical
by-products in the water and just above the surface will also be
damaging your lungs. Chlorine is the best disinfect to use in a
swimming pools and the only product compliant with German DIN
standards, but it forms by-products which are toxic, cause lung
damage and can lead to asthma in children. AFM filter media prevents
the formation of toxic chemicals, making chlorine safe to use
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With AFM and NoPhos is
possible run a busy public pool at 0.5mg/l free chlorine and less
than 0.2mg/l combined, we have even consistently achieved combined
chlorine levels below 0.02mg/l in 25m pools with over 1000 bathers
per day.
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AFM is self sterilizing
and does not incubate human pathogenic organisms such as Legionella
and MRSA
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AFM is a much more
effective a barrier than sand to Cryptosporidium oocysts, AFM
therefore prevent gastroenteritis and other serious intestine
diseases related issues.
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AFM saves money on
chemicals and power, and gives you much cleaner, brighter and safe
water in which to swim
Warning Note
The success of any product always spawns copycat
products, and AFM is no exception. The problem is AFM is a
highly processed product subject to over 1 million Euro of R&D
with the European Commission to make an activated product that
has a high performance manufactured under ISO9000 procedures and
certified under European regulations including UK reg 31. The
main issue however is that AFM is safe. A Risk Analysis was
conducted by one of the largest Water Companies in the world,
and AFM was confirmed to be safer than sand. AFM should
not be confused with a crush glass or glass sand type product which
are potentially very dangerous.
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