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Dryden Aqua Ltd Water Filtration Media |
|
Product Data Sheet AFM Grade 0 |
General Description,
characteristics & specification |
| 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 |
0.55 |
Trace |
Trace |
|
0.5 |
0.5 |
0.5 |
|
0.45 |
13.5 |
14.0 |
0 - 40 |
0.4 |
28.5 |
42.5 |
25 - 90 |
0.35 |
35.5 |
78.0 |
75 - 100 |
0.3 |
19.0 |
97.0 |
95 - 100 |
0.25 |
2.0 |
99.0 |
99 - 100 |
< 0.25 |
1.0 |
100.0 |
99 - 100 |
| Physical Properties |
|
| Colour & shape |
Brown or Green sub-angular
granules |
| Dust content limit |
< 0.1 % (m/m) below 100 micron |
| Grain effective specific gravity |
2.5 g/cm³ |
| Effective Size |
0.25 to 0.35 mm |
| Uniformity Coefficient |
1.5 or less |
|
Bulk density
- Loose
- packed
|
1330 kg/m³
1520 kg/m³ |
| Abrasion resistance (water only) |
< 3% loss after 100h backwash |
| Poured voidage |
0.41
– 0.44 |
| Packed voidage |
0.34 - 0.39 |
| Acid solubility 20% HCl / 24 h |
< 5% |
| Conditions for Operation |
Grade 0 is used
to the ultimate mechanical filtration performance, especially when the
filter can not be back-washed at high flowrates. |
| Bed depth |
10 – 100
cm, application dependent |
| Backwash rate |
25 -30
m³/m²/h |
| Expansion of bed after backwash |
15 – 20% |
| Service flow rate |
0.1 – 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. |
