afm sunAFM replaces sand in you filters, performance will improve and will give you filtration down to 1 micron for drinking water, waste water and seawater. AFM performance will be 2 to 30 times better than sand.  Parasites and bacteria are removed from freshwater, waste water is filter down to less than 1 mg/l solids, and pre-treatment prior to RO membranes reduces membrane fouling by at least 50%.


The Dryden Aqua manufacturing facility in Edinburgh has a capacity to process 40,000 tonne of glass a year. A second production facility to give 160,000 tonnes per year is planned to be on-line in under 3 years.  YTube video of production line; click here


afm iftsAFM is a subjected of ETV Environmental Technology Verification and is being used as a test product for the development of a new ISO standard on ETV. Certification is important, but certification is not verification that a product is actually fit for purpose.  ETV will bench mark products and will test their ability to actually perform in the manner described by the manufacturer.  AFM has already been extensively tested and compared against a range of filter media by the independent accredited laboratory IFTS in France.

Recent tests conducted by IFTS on grade 0 AFM (0.25 to 0.50mm psd) have confirmed a very high performance, >97% removal of all particles above 1 micron and >99.8% above 5 microns.  Tested were conducted at a water velocity of 20m/hr with no pre-coagulation or flocculation.  AFM grade 0 can therefore remove cryptosporidium and most parasites and large bacteria found in water.  Grade 1 (0.4 to 1.0mm psd) almost gave the same performance down to 4 microns.  AFM grade 1 is a direct replace for sand used in most drinking water gravity flow and pressure filtration em mesoporous surface

  • will reduce turbidity by more than 50% in most cases
  • protection against parasites such as cryptosporidium
  • 100%back-wash efficiency
  • guaranteed for 10 years, returned to Dryden Aqua at end of filters life for recycling
  • activated mesoporous surface ( see electron microscope photo) surface area is increase x 300 times to adsorb small particles dissolved organics and heavy metals
  • freshwater and marine applications, drinking water to the treatment of tertiary wastewater, from 0 to 90 deg C
  • Can be used for standard coagulation and flocculation to aid the removal of more dissolved organics and sub-micron particles

AFM is also very good at removing;
ferric, manganese, TBT, Chromium, we are also working on the removal of priority substances.

Return In capital

Two life cycle cost analysis have been conducted for the drinking water industry, and when compared against a high quality silica sand AFM gave a return in capital out of revenue savings in under 18 months, by Oakdene Hollins and the Carbon Trust.  Costs savings are achieved by a reduction in chemicals, chlorine oxidation demand, water and power.


Dryden Aqua invests heavily in R&D,  one of the  research projects is an FP7 in partnership with a European consortium and the Indian Government, titled The project relates to the treatment of surface water in India as well as arsenic contaminated ground water.  AFM is seen by the Indian government as providing the first simple yet sustainable solution to high arsenic concentration that impact on over 1/4 billion people in the country.


AFM is manufactured under strict ISO 9001-2008 production procedures  and the product is certified under Reg 31 for the UK drinking water.  International certification under NSF50 and 61 should be in place by October.

More information

If you would like more information on how AFM can improve water quality, reduce health risks and save money then let me know.

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Dr.Howard Dryden
Dryden Aqua Ltd
Butlerfield, Bonnyrigg
Edinburgh EH19 3JQ
T +44 (0) 18758 22222
F +44(0) 18758 23001

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