DAISY
Dryden Aqua integrated system for crystal clear and healthy swimming pool water
Dryden Aqua has developed an integrated pool water treatment system in which all of the components work together to provide a system in which the performance is far greater than the sum of the parts . As a marine biological company working in the pool industry , we have a unique knowledge of both water chemistry and biology . This knowledge combination has allowed us to design a fully integrated system that provides the best possible water quality with the lowest compliment of bacteria . The result is very clean water , so less chlorine is required to keep the water safe . The less chlorine used , the lower the concentration of chlorine disinfection by-products .
DAISY consists of tree integrated steps :
Step 1 : Filtration with AFM ®
What is AFM ® ?
AFM ® stands for Activated Filter Material , a revolutionary filter media made from clean green glass , developed and manufactured by Dryden Aqua . AFM ® exceeds the performance of quartz and glass sand by filtering at least 30 % more organics . AFM ® is bio-resistant and self-sterilising which means no biofilm is formed in the filter bed . This important feature makes the pool system healthier , ecological and more economical .
AFM ® has successfully been used in over 100 ‘ 000 public and private swimming pools worldwide . AFM ® is manufactured under ISO 9001-2008 standards and is a filter material certified under European standards for drinking water . AFM ® is a registered trademark and is exclusively made by Dryden Aqua .
AFM ® exceeds the performance of quartz and glass sand by far
1 . Crystal clear water : AFM ® filters much finer than quartz or glass sand . At 20 m / hr filtration speed , a nominal filtration of 5 microns is achieved without flocculation – AFM ® filters at least 30 % more organic substances than fresh quartz or glass sand . With optimised coagulation and flocculation with APF and ZPM , a nominal filtration of less than 0.1 microns can be achieved .
2 . Lower chlorine consumption means less secondary chlorine reaction products : chlorine is an excellent disinfectant . But in reaction with organic and inorganic substances it also produces undesirable , harmful reaction by-products such as trichloramine and THM ‘ s . The more chlorine is consumed the more secondary reaction by-products are produced . With AFM ® we can remove far more substances than with sand or glass sand . This applies particularly in connection with coagulation and flocculation . Everything that can be filtered out and removed in the backwash process doesn ’ t have to be oxidised . The better the filtration , the lower the chlorine consumption and the disinfection by-product production .
3 . Bioresistent – no home for bacteria , viruses and other pathogens : sand is a good mechanical filter , but it ’ s also an ideal breeding ground for bacteria . Within just a few days , every grain of sand is colonized by bacteria . They immediately form a mucus to protect themselves against the disinfectant . In this so-called « biofilm » live entire communities of bacteria and other pathogens – including Legionella . If you have no organic film in your filter , there are also no Legionella .
4 . No trichloramine – no chlorine smell : The biofilm converts urea to ammonium and provides the acidic conditions required for the formation of toxic combined chlorine in the form of trichloramine . After about 6 months autotrophic bacteria move in the biofilm . They produce organic matter from carbonates ( CO3 ). Organic matter production by the sand filters can be greater than the load exerted by the bathers . AFM ® does not support biofilm , organic load and chlorine demand will be at least 30 % lower and because there is no acidic biofilm , inorganic combined chlorine is 90 % lower . So with AFM ® as part of a DAISY system there is no chlorine smell , no sore eyes just perfect water and air quality .
5 . Filter function remains good with AFM ® for many years : All sand filters will suffer from bio fouling ; this always leads to bio-coagulation of the sand grain and worm-hole channelling . As soon as you have channelling there will be unfiltered water reaching the pool . AFM ® does not bio foul and does not channel , so there is no possibility of unfiltered water reaching the bathers . The pool water quality is therefore much safer . Due to filter contamination , the performance of a sand filter worsens dramatically after 6 - 12 months despite frequent backwashing . The performance of AFM ® remains consistently high for many years .
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