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Please click on the links below to see the various types of Media

An Introduction to 'A.F.M'

Sustainable Clean Technology

AFM is now set to replace sand in all gravity and pressure sand & media filters.Dryden Aqua manufacture AFM from recovered glass,  the handling and the processing of the glass imparts unique chemical and physical properties to AFM.

  AFM filter media
  • AFM® carries a permanent surface -ve charge which means it can remove particles much smaller than sand. AFM® can reduce organic levels by surface adsorption.

  • Surface catalytic properties makes AFM self sterilizing, we also observe cracking of humic acids, localized high oxidation potentials, and almost twice the capacity to remove iron from solution.

  • Smooth micro surface makes the AFM® much less likely to become fouled

  • The AFM® bed is much less likely to block of channel

  • Easy to back-flush, approx. 50% less water is wasted in cleaning AFM®

  • AFM® is much easier to keep clean than sand, and if you keep the AFM® clean, it should never need to be changed, or at least the service cycle will be greatly increased over sand.

  • The retained organic content of an AFM® bed will be much lower than an equivalent sand bed.
  • AFM® is easier to sterilize
  • Very high attrition strength
  • Sand and zeolites (air born dust) are classified as a grade 2 carcinogens because of the free silica,  zeolites are particularly dangerous.
  • AFM® does not contain any free silica and as such it is much safer to use than sand.

AFM grade 1 filtration media (Reference #

AFM (Advanced Filtration Media) grade 1 is the standard sized AFM media equivalent to 16 x 30 grade sand.

Maximum water flow rate through a bed of grade 1 AFM is 30 cubm/sqm/hr, recommended flow rate for clean water application is 20 cubm/squm/hr, recommended maximum flow rate for dirty water and tertiary treatment of sewerage effluent 10 cubm/sqm/hr

AFM grade 2 filtration media (Reference #

AFM (Advanced Filtration Media) grade 2 is used as a support media for grade 1 and grade 0. Sufficient grade 2 should be used in all pressure filters to cover the laterals or support plate to a depth of at least 100mm.

Supplied in 25kg sacks, grade 1 particle size 0.5mm to 1.10mm. Media should be used on top of a layer of grade 2 AFM.

Applications include; tertiary treatment of sewerage effluent, swimming pools, fish farms and industrial waste water filtration.

SKU Description


AFM-001 25kg Bag of Grade 1 AFM - Fine Media £35.73 + Vat Order
AFM-002 25kg Bag of Grade 2 AFM - Slightly Courser £35.73 + Vat Order

Shipping on UK Mainland £10.00 per 25 kg Bag will be applied because of the weight ..  

Below you will see the links to the various sections on this very large subject covering all the
type of Filtration Systems we recommend.


Please contact us if we can help in any matter <>