A.F.M Information Back to Filter Media Page One

WHY SHOULD YOU USE AFM ?

AFM will remove smaller particles from the water. Under controlled conditions.
Using 16 x 30 grade sand at a flow rate of 10 cubm/hr/sqm sand removed approx 90% of
all particles down to 10 microns. AFM grade 1 under the same conditions reduced
particle size down to 5 microns.

In addition to removing solids by physical processes, AFM has a surface - vo charge
which allows it to remove very small particles and organic modules by surface

adsorption. AFM is excellent at removing + ve ions such as iron and manganese.

In addition to the surface -vo charge we have developed surface catalytic properties
for AFM. When AFM is used to filter water containing at least 1 mg/l of dissolved
oxygen the AFM will dissociate the oxygen molecule to generate two free radicalsof oxygen . The free radicals provide a degree of surface disinfection as well as cracking organic molecules on the surface of the AFM.

The performance of sand deteriorates due to surface contamination. However AFM
is largely self sterilizing and is cleaned with approx 50% less back flush water.The life of the AFM may therefore span the life of the filter. In the tartiary treatment of sewage the media can last for 5 years, in clean water applications it is likely to be in excess of 15 years.

 

HOW TO USE AFM

AFM is very easy to use . It is a direct replacement for sand in all pressure or gravity
flow sand filters. Simply remove the sand and replace with AFM. In all application
s
and water flowrates tested. AFM out - performed sand. However in both cases best performance is acheived using the slowest flowrates.

The filter should be layered with either pea gravel or grade 2 AFM as the bottom layer
the quantity of base material will depend on filter design, however it is normally 10%
to 20% of the total bed volume. Grade 1 AFM is placed on top of the grade 2. For very
performance grade 0 may be used on top of grade 1. If grade 0 is used approx 10% of
the total bed volume should be grade 0.

 

 

WHAT IS AFM ?
AFM is an advanced filtration media designed to replace filter grade sand in presurre
filters and gravity flow filters. AFM is far superior to a good quality filter sand.
Changing from sand to AFM will result in some major improvements to thebrperformance of your filtration system.

AFM is manufactured and activated from reprocessed glass. AFM is therefore an
enviromentally sustainable product.
AFM MEDIA

WATER FLOWRATES

The recommended water flowrate will depend on the filter design, type
of water treated, and water quality required. The following can be used
as a guide to sizing a filter for use with AFM.

Potable ( drinking water ) mmmmmmmmm15 to 10cubm/hr/sqm
Swimming Pools & Fish Farmsmmmmm
10 to 15 cubm/hr/sqm
Rivers & Sea Waterlllllllllllllllllllllllllllllll10 to 15 cubm/hr/sqm Industrial Effluentmmmmmmmmmmm j 5 to 10 cubm/hr/sqm
Landfill Leachatemmmmmmmmmmmm
3l to jj6 cubm/hr/sqm
Tertiary Treatment Of Sewage mmm m 3 ito8 6 cubm/hr/sqm

BACK - FLUSHING

A back-flushing water flowrate of 25 to 50 cubm/hr is required . The optimum flowrate depends on the type of water being treated and thedegree of bed expansion required to clean the AFM

AFM SPECIFICATIONS

Appearance
AFM has a similar appearance to sand.

Standard Particle Size

Grade 0 mmmmmmmmmmmm0.25mm to 0.5mm
Grade 1nnnnnnnnnnnnnnnnn
ln0.5mm to 1.0mm
Grade 2kkkkkkkkkkkkkkkk
1.0mm to 2.0mm