Replaces sand in all filtration applications. AFM® is manufactured from a specific glass type and processed to obtain the optimum particle size and shape. It is then activated to increase the surface area by 300 times over crushed glass or sand.
The high surface area is negatively charged (zeta potential) to adsorb organics and small particles. It also has permanent metal oxide catalysts creating a high redox potential to make AFM® self-sterilizing.
AFM® is the only activated glass filter media available, and is more efficient and cost-effective than any other filtration media. AFM® is certified under Regulation 31 in the UK and International NSF61.It is also in compliance with European Water Directive (98/83/EC) & (80/778/EEC).


Benefits at a glance:

  • 100% resistant to bio-fouling
  • Filters twice as good as sand
  • Very short pay back
  • Long life span
  • Ecological and economical solutions

Operating criteria:

Recommended filtration speed: 15 - 30 m/h
Air purge: 60 - 100 m/h (if necessary)
Backwash: 40 - 50 m/h
Desired filter bed expansion: at least 15 %


AFM® grade 1 specification:

Specific weight: 1‘250 kg/m3
Effective size: 0,6 mm
Spherizity: > 0,8
Roundness: > 0,7
Uniformity coefficient: < 1,3
Cross-sectional ratio: < 2,4
Specific gravity: 2,5
OAD: > 10
Purity: 99,95 %
AFM® is supplied in 21 kg (47 lbs) bags or 1000 kg (2200 lbs) big bags.

IFTS Particle size removal performanceThe Dryden Aqua Team is proud to share with you the excellent outcome of the tests on AFM® in comparison with quartz sand and other glass filter media that were conducted by the “Institut de la Filtration et des Techniques Séparatives” IFTS in France.

Dowload the ITFS report in PDF

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