Clean Water Treatment systems

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Clean WaterTreatment systems
By Marine Biologists specialising in water quality
www.AFM.eu
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Applicationssome of the water treatment
applications

• Potable water AFM does not biofoul so performance
  much better than sand
• Rivers, performance much better than sand, can
  cope with variable loads
• Lakes, will remove algae and protozoan oocysts
  without bacteria coagulation
• Boreholes, iron, manganese and arsenic removal
• Desalination
• Treatment of seawater prior to membranes, when
  coupled with sono-chemical or chemical
  coagulation AFM filtration has a much higher
  performance than UF because we remove dissolved
  organics
• Lower silica, phosphates , algae and bacterial
  levels
• Aquaculture and public aquaria, afm is the
  leading filter media in Europe
• Boiler feed water
• Cooling towers
• Gray water recirculation
• Water supply to electronics industry
• Swimming pools, afm is the leading filter media
  in Europe

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Water treatment products

• Products developed and manufactured by D.A. that
  will provide revenue savings and improve water
  quality
• Key products
• AFM (active filter media)
• ZPM (zeta potential static mixers)
• ZPMr (resonating ZPM unit)
• Cationic and anionic inorganic flocculants
• pH correction strategy
• Chlorine free residual disinfection a goal that
  is now insight ?
• Remove arsenic with NoPhos or APF and AFM media

oxygen Probes
Ceramic oxygen diffuser
Degassing oxidation
Drum filters 100 plastic
Degassing oxidation
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Schematic of water treatment
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Main issueswhat do we want to achieve

• Clean clear water with a good taste, no colour
  and no smell
• Low turbidity, less than 0.02 ntu
• Low oxidation demand high oxidation potential
• Zero or low chlorine or bromine reaction product
  precursors
• Chemical water quality
• Heavy metals, Fe Mn. Hg, and metalloids such as
  arsenic at low levels
• Silica, phosphate and ammonium levels reduced or
  eliminated
• Dissolved organics, humic and fluvic acids,
  eliminated
• Bacteria and human pathogens
• prions, endotoxins viri, bacteria, cyanobacteria,
  yeast protozoa such as crypto giardia,
  nematodes etc etc eliminated

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Dryden Aqua problems solved

• Clean clear water with a good taste, no colour
  and no smell
• Dryden Aqua system will reduce turbidity levels
  by at least 30 over sand filters
• Chlorine reaction product precursors are reduced
  and almost eliminated
• Chemical water quality
• Efficient removal of heavy metals Fe Mn by
  precipitation and adsorption, metalloids such as
  arsenic removed by pre-oxidation,, mechanical
  removal and adsorption.
• Zero bacteria and human pathogens
• AFM filter bed has on average a 100,000 lower
  bacteria cell biomass than a sand filter. AFM is
  not biologically unstable like sand media in RGF
  or pressure filters.
• Reduction of chemicals used and residual
  chemicals remaining in the water after the
  filters
• Chlorine and residual chemical consumption
  reduced by at least 50 because the system is
  more efficient at removing reductive chemicals
  and solids.
• Reduce bio-nutrients and thereby reduce biofilm
  in the pipe work, biofilm generates organic
  matter and reaction products.
• Carbon foot print and savings
• Reduce carbon for print, AFM 15 lower pressure
  differential, 50 less back-wash water
• Normally gives a return in capital out of revenue
  savings in under 18 months, through water,
  chemical and energy savings

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Dryden Aqua how to achieve the results

• Efficient coagulation and flocculation
• Cationic and anionic pre-coagulation and
  flocculation
• ZPM units and resonating ZPMr units used to make
  optimise coagulation and change zeta potential of
  water
• Mechanical filtration
• Replace sand with AFM which is an activated
  filter media
• Zeta potential control of product water
• Increase zeta potential as well as the oxidation
  potential
• ZPMr used to change the zeta potential
• Make all surface in contact with the water a high
  zeta potential, surfaces become self sterilizing
  and self cleaning.

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Performance summary
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Stage 1 Coagulation Flocculation Remove the
dissolved components

• Coagulation and Flocculation of dissolved
  chemicals and suspended solids

Cationic flocculation with APF or PAC Anionic
flocculation with ACO ZPM zeta potential mixer to
make the products work
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pH controlessential for efficient coagulation

• The pH of water depends on the chemistry, optimum
  is pH 7.5 /- 0.3 pH units
• If the water is too acidic.
• Use divalent base such as Ca or Mg hydroxides to
  increase pH and drop zeta potential to improve
  flocculation. Do not use mono-valent ions such as
  Na or K hydroxides to correct pH.
• If the water has too high a pH (alkaline)
• use HCl to drop pH
• Acidification if required should be applied
  before cationic flocculation
• Addition of a base if required after cationic
  flocculation but before anionic flocculation.
• pH has a profound impact of zeta potentials,
  redox potentials and the functionality of the
  flocculants.

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Coagulation and flocculation

• A high percentage of the loading on the filters
  and oxidation demand on disinfectants such as
  chlorine will be from dissolved organics.
  Coagulation drags these chemicals out of solution
  it is therefore critical to the performance of
  the water treatment system, and reduction of
  oxidation demand.
• Inorganic flocculants should be used in
  preference organic flocculants to reduce organic
  load and demand for chlorine in the product
  water.
• Most flocculants used, such as Al Fe are
  anionic to coagulate and flocculate -ve charge
  chemicals and solids, they do not coagulate or
  flocculate positive charged dissolved chemicals
  or solids.
• Two stage process. Dryden Aqua recommend a two
  stage coagulation and flocculation with cationic
  (ACO) followed by anionic (APF) flocculation with
  ZPM static mixers.

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Coagulation and flocculation 2cationic
flocculation

• Remove ve charge chemicals and solids
• A small percentage of suspended solids, bacteria,
  dissolved organics and all metals will have a ve
  electrical charge. In order to remove these
  components the pH needs to be increased if it is
  below pH 7. Cations account for some 20 of the
  total.
• Cationic coagulation
• applied to pull the dissolved components ve
  charged cations and molecules out of solution by
  sequestering metals and coagulation of organics.
  The coagulated solids and suspended solids have
  now been changed from a ve to a high -ve zeta
  potential.
• Cationic flocculation
• Coagulated dissolved component solids will now
  increase in size by flocculation
• The ve charge solids can now be trapped by the
  anionic flocculants
• Approximately 4 times more cationic flocculent is
  used in relation to anionic flocculent.
• Any residual cationic flocculent will be removed
  by the anionic flocculent.

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Coagulation and flocculation 3anionic
flocculation

• Anionic flocculants
• polyaluminium (PAC) should be used in preference
  to aluminum sulphate. Dryden Aqua are now
  manufacturing PAC and APF because PAC supplied
  for potable water can sometimes contain high
  levels of phenolic substances
• Cationic and anionic flocculent combination
• The combination of cationic followed by anionic
  coagulation and flocculation removes a great deal
  more dissolved and suspended solids. In addition
  to PAC, APF contains trivalent earth metals that
  are used to remove arsenic and phosphate.
• The floc formed is more stable and heavier
• Anionic (APF) and cationic (ACO) flocculants
  react together to form an aluminosilcate that
  drops out of suspension as a feldspar and will
  also absorb ammonium and dissolved organics.

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Coagulation and flocculation 4chemical genesis

• Dryden Aqua are experts in aluminosilicate ion
  exchange and absorption systems.
• When slightly excess cationic flocculent (ACO) is
  used with PAC or APF, the two products react
  together to form and third product which is an
  insoluble aluminosilicate floc.
• The aluminosilicate floc is very easily removed
  by the filters. The new product formed (feldspar)
  exhibits cationic exchange properties and may
  remove ammonium as well as absorb residual
  organics. The stable floc is easily removed by
  back-washing the filters

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Coagulation and flocculation 5 ZPM zeta
potential mixer

• Dryden Aqua have developed a new range of static
  mixers called ZPM units. cationic and anionic
  flocculants work because they change the zeta
  potential of the water.
• Coagulation reactions occur over a fraction
  second. If the chemicals are not mixed quickly
  and intimately with the water, coagulation and
  subsequent flocculation performance will be
  seriously compromised.
• ZPM units not only mix the flocculant, but they
  also cause cavitation and chemical changes to the
  water. For example, the zeta potential of
  colloidal suspension of negative charged oil
  droplets (milk) can be clarified without
  chemicals by imparting mechanical energy to form
  a flocculated solid (butter). We can now perform
  the same task with water.

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Stage 2 Filtration Remove flocculated
suspended solids

• Mechanical filtration to remove
• suspended solids

Active Filter Media Replaces sand improves filter
performance by at least 30
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Stage 2 Sand or AFM filtrationpressure or RGF
filters
DIN standard filters
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AFM active filter media

• AFM is an Active Filter Media and direct
  replacement for sand in all types of sand
  filters.
• AFM provides a stable predictable performance
• AFM does not need to be replaced, the media may
  be used for the life of the filter, and can be
  recycled and used again.
• AFM will improve water quality and reduce
  operation costs.
• AFM is in compliance to Reg 31

Dr. John Hargreaves (Chief Executive Scottish
Water) Minister for the Environment of Scotland
Mr.Ross Finnie visit our site
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Water filtration 1UF or AFM ?

• Potable water filtration is either accomplished
  by UF ultra-filtration membranes at 0.01 to 0.03
  microns or by media beds such as sand filters.
• Ultra-filtration provides absolute filtration and
  has the advantage that it provides a very
  effective barrier to oocyst of cryptosporidium.
  However UF can not be used with coagulation and
  flocculation because it blocks the membranes.
  This also means that dissolved organic matter can
  not be removed by UF, which in turn results in
  the formation of THMs after the water is
  chlorinated. AFM filtration should therefore me
  used before membranes. If membranes are the only
  form of water treatment then the water should
  not be chlorinated after filtration.
• Coagulation and flocculation for organics and
  heavy metals, can be used with AFM media to
  remove chlorine oxidation reaction product
  precursors. AFM reduces the formation of THMs,
  cyanogen chloride, inorganic and organic
  chloramines

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Potable water filtration 2

• Media bed filters may be slow bed sand filters or
  rapid gravity filters.
• Slow bed sand filters have the potential to
  provide excellent water quality but because of
  their large space requirement, but the technology
  is being phased out.
• Slow bed sand filters are bio-mechanical filters.
  RGF and pressure sand filters are also
  bio-mechanical, but the biofilm will compromise
  filter stability and performance. AFM should
  therefore be used as opposed to sand in these
  filters.

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Potable water filtration 3slow bed sand filters

• Slow bed sand filters account for some 20 of all
  potable water filtration in the UK.
• Sand and aggregate are used in slow bed filters
  as excellent substrates for growing bacteria
• Slow bed filtration is a bio-mechanical process
  and is dependent on a high ecological diversity
  of micro-organisms growing on the aggregate.
• The large size of slow bed sand filters allows
  the filters to reach a state close to endogenous
  respiration which means they do not produce
  bacterial sludge.
• RGF and pressure filters can not achieve
  endogenous respiration so they must generate
  bacterial cell biomass which is discharged into
  the product water and back-wash water.
• Bacterial cell biomass on RGF or pressure sand
  filters is unstable, autotrophs generate organic
  matter, and filters are prone to wormhole
  channeling which compromises performance

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Potable water filtration 4rapid gravity sand
filters

• Sand, aggregate, anthracite or activated carbon
  used in RGF pressure filters will support the
  growth of bacteria, this can not be avoided.
• Temperatures above 15 deg C heterotrophic
  bacteria can double in population every 30
  minutes. One bacterium may therefore become 1413
  bacteria in 24 hours with a biomass of 100s of
  Kg. The only limiting factor is the availability
  of food for bacterial growth.
• Endogenous bacterial respiration can not be
  attained in RGF filters and as a consequence
  they tend to be biologically unstable and will
  occasionally discharge bacteria into the product
  water.

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Biofouling of sand and AFM

• RGF filters are biologically unstable, and will
  dump bacteria into the product water at a set
  frequency
• Similar graphs were obtained for iron and
  manganese.
• Sand filter bacterial levels are higher in
  product water than influent water.
• AFM resist biofouling and will reduce bacterial
  levels.
• Data provided by Scottish water

50 lower bacterial levels and no bacterial
spikes with AFM. Tests conducted by Scottish Water
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Biofouling of sand and AFM

• Electron micro graphs of sand and AFM
• Sand has 100 bacteria coverage after 3 days in a
  drinking water filter
• AFM stays free of biofilm, even after 5 years in
  sewage effluent
• Alginates excreted by bacteria coagulate the sand
  and cause wormhole channeling.

New sand
Used sand
New AFM
Used AFM
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Bacteria levels on sand and AFMtransient worm
holes
Sand filters are biological, but they are also
mechanical and will remove coagulated /
flocculated particles. But they can also dump
collected solids, bacteria, endotoxins, oocysts
back into the product water due to their
biological instability or when a transient worm
hole channel opens up.
Media samples were taken just prior to a
back-wash at a depth of 200mm into the bed, and
500 mm from the side of the filter. Bacterial
levels on AFM and sand after 3 months in a clean
water filter. The Table is certified data showing
total bacterial levels of 3.6 million with sand,
and essentially zero with AFM.
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Bacteria biofilms
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Water filtration 5rapid gravity sand filters

• Bacteria produce a muco saccharide alginate which
  they use to glue themselves onto the surface of
  sand.
• Bacteria species will evolve and adapt to
  conditions within the filter bed. Population
  densities and species diversity will gradually
  increase over a period of weeks, months or
  several years, depending on water temperatures ,
  water quality and the availability of food.
• Eventually the alginates will start to stick the
  sand grains together which will promote a
  differential pressure across the filter bed
  leading to the development of transient worm-hole
  channels
• The performance of sand filters start to
  deteriorate from the date of commissioning.

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Potable water filtration 6rapid gravity sand
filters

• Bacteria alginate coagulation of sand leading to
  differential pressure, higher pressure drops and
  transient worm-hole channelling can not be
  avoided.
• The effect of bacteria can be minimized by
  aggressive air scouring and efficient
  back-washing. However the bacteria will adapt to
  these conditions and will reach an equilibrium,
  but filter performance is still compromised.
• Chlorine must not be injected into the water
  before sand filters, the process does not work
  and it simply produces a high concentration of
  disinfection by products DBR
• The sand bed may be taken off-line and purged
  using a high concentration of chlorine or
  chlorine dioxide every 3 to 6 months to remove
  the bacteria. This makes a substantial difference
  to filter performance but is takes time, costs
  money and can cause problems. A better solution
  is needed, and this is where AFM comes in.

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Potable water filtration 7rapid gravity AFM
filters

• Dryden Aqua operate sand filers in nutrient rich
  water, under these conditions it is almost
  impossible to economically operate the filters
  due to accelerated biofouling and coagulation of
  the sand.
• In order to solve the problem Dryden Aqua
  research biologists developed an amorphous
  aluminosilcate AFM (active filter media) with a
  surface structure that prevents bacteria from
  growing.
• AFM was developed out of a 1.2 Euro pounds
  research project supported by the European
  Commission, UK Government and Scottish Water.

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Potable water filtration 8AFM and how it works

• AFM filter media is a direct replacement for
  sand in all pressure or rapid gravity sand
  filters. No modification to the sand filters or
  their mode of operation is required
• The surface of AFM has catalytic properties which
  dissociates dissolved oxygen to produce short
  lived oxygen free radicals. The free radical
  raise the surface redox potential which makes the
  media self sterilizing. AFM can even be used in
  simple filters for the treatment of sewage
  effluent without any biofouling issues.
• AFM has also been engineered to have a high
  negative surface zeta potential which helps in
  the surface adsorption of organics, even without
  the use of coagulation.

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AFM zeta potential

•  High -ve zeta potential adsorbs ve ( -ve)
  particles and organics

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AFM is an active filter mediaAdsorption

• Sand generates dissolved organic matter (DOC)
  through autotrophic bacterial cell growth
• Hydrophilic surface with a negative Zeta
  potential of AFM adsorbs small particles and
  dissolved organic molecules from water.
• Major reduction in DOC and this is without
  coagulation

DOC levels approx 50 lower after AFM Tests
conducted by Suez Lyonnaise des Eaux
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Autotrophic bacteria growth on sand

• Autotrophic nitrifying bacteria rapidly become
  established on sand
• The autotrophs increase the suspend solids as
  well as DOC level in the product water by
  converting inorganic carbon to organic carbon.
• The extracellular alginate excreted by bacteria
  form worm holes and coagulation of sand.
• AFM resists biofouling and stays clean

The above two graphs show that the sand is
becoming a biofilter as indicated by the reduced
ammonium and high nitrite levels. Test conducted
by Scottish Water.
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Potable water filtration 8AFM and how the filter
works

• AFM media does not biofoul, so the filter bed is
  not subject to bacterial coagulation. The
  filter bed does not experience a differential
  pressure gradient, pressure drops are reduced and
  worm-hole channeling is eliminated.
• The pre-coagulation and flocculation stage
  should use inorganic anionic coagulants that
  impart a positive charge to all the particles.
  Particles that are too small to be mechanically
  removed by the filter bed are electrostatically
  adsorbed by the negative charged on the AFM.
• The physical and chemical properties of AFM are
  permanent, the media does not need to be
  regenerated or changed for the life of the filter
  bed. Indeed the media may be recycled many times.

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Potable water filtration 9AFM verses sand
filtration

• What goes into a filter must come back out in the
  back-wash
• The graph opposite is the back-wash profile for
  identical sand and AFM filters after 10 weeks.
• The profile shows that 30 more solids are
  back-washed out of the AFM.
• AFM performance is maintained while sand filters
  continue deteriorate with time.

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Data from trials conducted by Suez Lyonnaise des
Eaux 30 improvement after 10 weeks, 50 after
52 weeks.
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Potable water filtration 10AFM performance
benefits

• AFM media will remove a minimum of 30 more from
  water than is possible for a sand filter.
• Lower levels of organics in the product water
  lead to lower levels of disinfection by-products
• AFM filter performance is stable and predicable
• AFM eliminates worm-hole channeling, thereby
  reducing the risk of solids, dissolved components
  and cryptosporidium oocysts by-passing the filter
  bed
• An improved water quality reduces the oxidation
  demand and lowers chlorine chemical consumption

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Potable water filtration 11AFM operational
criteria

• The performance of any media bed filter will vary
  indirectly proportionally to the flow of water,
  so it is always best to run the filter at the
  slowest possible run phase water flow.
• Optimum conditions
• Run phase water flow 5 to 10 cubm/hr/sqm
• Air purge flow 95 cubm/hr/squm
• Back-wash water flow 45 to 55 cubm/hr/sqm

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Disinfection and zeta potential after the
filters

• The lower the concentration of organic matter and
  reducing agents such as Mn or Fe the lower the
  chemical oxidation demand for chlorine.
• AFM filtered water is very easy to disinfect, or
  for further treatment by membranes or ion
  exchange
• When reducing agents such as organic matter are
  eliminated, chlorine will not be consumed.
• When the water is passed through a resonating
  ZPMr unit, the zeta potential is again dropped
  which has the effect of increasing the oxidation
  potential without chemicals.
• The ZPMr unit also makes the chlorination
  reactions more effective and takes over the role
  of chlorine by initiating residual oxidation
  without chemical consumption

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ZPMr zeta potential resonator

• By simply moving water you change the zeta
  potential and the ability for bacteria to
  survive. This is why it is safer to drink moving
  water rather than static water.
• The ZPMr unit imparts mechanical energy into the
  water by spinning it at a high velocity. At the
  same time ultrasonics at a specific frequency
  shakes the water and causes cavitation nano
  bubbles. When the bubbles implode a huge amount
  of energy is released which affects a change in
  water structure. The processes is called
  sonochemistry and has the effect of disinfecting
  water.
• The zeta potential, redox potential and hydrogen
  bonding of the water molecules are altered and a
  memory is imparted to the water that maintains a
  residual disinfection properties without the use
  of chemicals.

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ZPMr (zeta potential resonator) 2

• ZPMr technology is the IPR of Dryden Aqua, as yet
  it is very new and no information is available in
  the literature on similar technologies.
• A research project is in progress with a water
  treatment system for swimming pool water.
• The technology will change the way water
  molecules relate to each other (hydrogen
  bonding) and has the potential to make water
  self sterilizing without the use of any chemicals.

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Water storage 1.self sterlizing water

• In most water treatment systems the water will be
  stored in large underground reservoir tanks
  prior to entering the distribution network.
• When water is not exposed to sunlight (Uv
  irradiation ?) or if it is relatively static in a
  large tank. The zeta potential will drop and then
  start to become positive, the oxidation potential
  of the water will drop. Chlorine will be reduced
  and bacteria will start to grow. It is therefore
  essential to keep the water moving when stored
  in large tanks.
• A proportion of the water may be recycled via a
  Uvc unit. The Uvc does not kill bacteria by
  irradiation but by a change in the zeta potential
  and an increase in oxidation potential (free
  radicals).
• A ZPMr unit is likely to be much more effective
  than Uvc and will have a longer lasting impact on
  the water. In its true sense the water develops
  a memory and will become self sterilizing
  without the use of chemicals

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Water storage 2ACO
ACO Active Chemical Oxidation

• We are now able to maintain sterile tanks of
  water and swimming pool water without the use of
  oxidizing agents. However in order help maintain
  a high zeta potential and make the water wetter
  by addition of a cationic poly-silicate ACO.
• Phosphate is used to form a calcium phosphate
  scale on the inside of pipes, especially if there
  is lead in the system. However phosphate is a
  micro nutrient for bacteria and will promote the
  growth of bacteria on the inside of the pipes, an
  alternative approach should be considered
• The alginate coat excreted by bacteria protects
  the bacteria from chlorine oxidation. Chlorine
  has zero impact on bacteria growing on the
  inside of pipes. Indeed it can actually promote
  the growth of certain species of bacterial that
  produce copious quantities of alginate such as
  Pseudomonas spp

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Water storage and water distribution network

• It is impossible to stop bacteria growing on most
  surfaces in contact with the water, including the
  inside of plastic and metal pipes such as lead
  pipes. Chlorine at levels as high as 5mg/l will
  not kill bacteria on the inside of pipes because
  the alginates excreted by the bacteria protect
  them from oxidation.
• Bacteria excrete acids which causes corrosion or
  increase the solubility of heavy metals such as
  lead. So while phosphate and calcium phosphate
  scale may minimize the leaching of lead, it also
  has the potential to make it worse by causing
  high spikes of lead when it breaks through the
  scale. The practice of using phosphate leads to a
  biologically unstable system in piework.
• By altering the zeta potential of the water with
  the ZPMr unit and by the addition of low levels
  of ACO to the water, this may offer a better
  alternative to addition of phosphates, and at
  the same time it will reduce the oxidation demand
  on chlorine.

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Water distribution network

• Given the instability of sand filters and the
  presence of organic matter and the addition of
  phosphates and ammonium, this creates a perfect
  environment for the growth of both autotrophic as
  well as heterotrophic bacteria in the water
  distribution network.
• The autotrophic bacteria will increase the
  organic concentration of the water by converting
  inorganic carbon to organic carbon. This will
  increase the oxidation demand and use of
  chemicals.
• By an understanding of the mechanism, water
  chemistry and biology, it should be possible to
  eliminate the biofilm from the inside of the pipe
  work. By elimination of the bacteria, leaching of
  lead will be reduced as well as the chlorine
  demand.

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Closing comments

• Two stage coagulation to remove dissolved
  components and AFM media bed filtration the
  water quality will be improved and oxidation
  requirements greatly reduced.
• If the oxidation demand of the water is reduced
  to zero, then no chlorine will be consumed. The
  role of chlorine is therefore a protective
  mechanism or insurance in the event of a pipe
  failure.
• If the oxidation demand of the water is reduced
  to zero or a low level, then subtle changes to
  the zeta potential with a ZPMr and possibly with
  the addition of polysilicates or ACO may be all
  that is required to insure biological compliance.
  
• We hope to eliminate the use of chlorine in
  drinking water public swimming pools industry
  over the next 12 months.

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Dryden Aqua Products manufacture for Water
treatment
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Dryden Aqua productsmanufactured in Scotland

AFM is supplied in 25 kg bags or 1 tonne bags
APF is supplied in 20 litre and 5 litre containers
ZPM units from DN40 ( 1 ½) to DN300 (12) as
standard units. Water flow from 5 to 250 cubm/hr
NoPhos is supplied in crystal form in 1 kg
containers or as a liquid concentrate in 5 litre
and 1 litre containers
Pressure filters , Dryden Aqua manufacture and
only supply full DIN specification filters in
steel and GRP
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Dryden Aqua productsmanufactured in Scotland
Air diffusers aeration systems

oxygen Probes
Ceramic oxygen diffuser
Degassing oxidation
Drum filters 100 plastic
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Dryden Aqua

• Dryden Aqua LTD
• Butlerfield
• Bonnyrigg
• Edinburgh EH19 3JQ
• Scotland. UK

Tel [phone] Fax [phone]
22229 www.AFM.eu sales_at_drydenaqua.com
50
Open your eyes to innovation and blue water

• Dryden Aqua Ltd
• Butlerfield
• Bonnyrigg
• Edinburgh EH19 3JQ Tel [phone] Fax 018758
  22229
• www.DryenAqua.com www.AFM.eu
  www.Ozone.co.uk