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Dryden Aqua Ltd Water Filtration Media

Product Data Sheet AFM® Grade 1

General Description, characteristics & specification Grade 1

AFM® meets the stringent standards called for in the field of water filtration in compliance with BSEN 12904 European standard.

Purpose: AFM® is a high quality granular filtration material. It is graded specifically for water filtration installations.

Aperture (mm)

Percent retained (by weight)

 

Typical Grading

 
 

Fractional

Cumulative

Cumulative Range

1.18

Trace

Trace

0 – 0.5

1.00

1.0

1.0

 

0.85

11.0

16.0

0 - 40

0.71

30.5

40.0

25 - 90

0.60

37.5

79.0

75 - 100

0.50

17.0

96.0

95 - 100

0.40

2.5

99.0

99 - 100

< 0.40

0.5

100.0

99 - 100

Physical Properties 
Colour & shapeBrown or Green sub-angular granules
Dust content limit< 0.1 % (m/m) below 160 micron
Grain effective specific gravity2.5 g/cm³
Effective Size0.5 to 0.7 mm
Uniformity Coefficient1.5 or less

Bulk density

- Loose

- packed

 

1250 kg/m³

1450 kg/m³

Abrasion resistance (water only)< 3% loss after 100h backwash
Poured voidage0.48 – 0.54
Packed voidage0.40 - 0.46
Acid solubility 20% HCl / 24 h< 5%
Conditions for Operation 
Bed depth

30 – 300 cm, application dependent

Backwash rate

40 – 50 m³/m²/h

Expansion of bed after backwash

15 – 20%

Service flow rate0.1 – 50 m³/m²/hr in accordance with standard practice and specific application.  Filter performance is inversely proportional to flow, so it is always best to operate the filters at as slow a flowrate as possible.

Disclaimer: The information set forth in this Product Data Sheet represents typical properties of the product described; the information and typical values are not specifications. Dryden Aqua Ltd makes no representation or warranty concerning the Product, expressed or implied, by this Product Data Sheet.  The AFM® was analysed by an independent laboratory.