AFM

Activated Filter Media

AFM is manufactured from green amorphous aluminosilicate to replace sand in all types of sand filter. AFM offers a revolutionary step change by providing better than a 30% performance improvement over sand. Independent whole life cycle analysis confirms a return in capital from power and chemical savings in less than 8 months.
The activated surface of AFM is self-sterilizing which prevents bacteria mud-balling, coagulation and channeling of unfiltered water through the filter bed. Activation increases the surface area by 300 times for catalysis and adsorption reactions. Similar to activated carbon, the surface nano-structure adsorbs pollutants from the water but unlike carbon, AFM is recharged by just back-washing with water. AFM is a sustainable cradle-to-cradle product in keeping with the circular economy.

Key Point

  • Lower running costs & better performance:
    AFM filters at least 30 % better than sand. A return in capital can be expected in less than 8 months.
  • AFM will last for the life of the filters:
    And should never need to be changed.
  • Lower consumption of chlorine:
    AFM performs better than sand, so the water has a lower chlorine oxidation demand, up to 50% less chlorine.
  • Lower disinfection by-products:
    AFM will reduce disinfection by-products by at least 50% because we use 50% less chlorine.
  • Ferric, arsenic & manganese:
    AFM is the perfect filter media for the sustainable control of heavy metals and metalloids.
  • Priority substances:
    AFM will effectively remove some priority substances. Pretreatment research is being conducted to enhance the performance and expand the range of priority substances that can be removed.

Why is biofilm a problem for Pressure and RGF filters?

Silica sand is a good filtration media but it also makes a perfect home for growing bacteria. Bacteria are required in biofilters and slow bed sand filters but in rapid gravity or pressure filters the bacteria cause a biodynamic mechanical instability of performance. Bacteria like to stick themselves onto the sand by secreting an alginate jelly. The alginate forms a film that provides a home for the bacteria and even protects them from oxidation by chlorine. The problem is that the alginate glues the sand together and blocks the bed, especially during the summer months, AFM solves this problem. The bacteria can double in biomass every  30 minutes, the alginates secreted by the bacteria increase the Delta P and can half the length of the run phase. The alginates also glue the sand grains together and promote the development of wormhole channeling

AFM to replace sand in all sand filters

AFM reduces the biological risk from bacteria and parasites as well as the chemical risk. AFM does not channel so it is an effective barrier against Cryptosporidium and giardia. AFM does not incubate or discharge bacteria, indeed it will reduce the bacterial load of the product water. Also because of the better filtration performance, there are lower THM concentrations. AFM provides the potential to remove some priority substances, research is in place to further enhance the product performance and expand the range of priority substances that can be treated.

Quality and certification

  • AFM is an engineered product manufactured to a precise specification under ISO9001-2008 conditions
  • Certified under Reg31, NSF50 & NSF61, Environmental standards, HCAAP and others
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