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Filterability Index Unit


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The PEIF is an unit for demonstrating the filtering process through a porous media. It enables a water quality test to be made
on a suspension to be
filtered through sand or similar granular media.
This unit utilises a bed of granular material, normally sand, which can be chosen by the student to suit his own purposes.The m
easurements taken
with this unit enable a filterability index to be calculated which has significance in deep bed filter performance.
The PEIF unit is a bench-top unit composed of a feeding tank, where the initial solution of water with solids in suspension is
placed. During the
normal operation, the tank is communicated with the sand filter upper part, through a pipe of 10 mm diameter. The filter lower
part is
communicated with the flowmeter. A regulation valve located at the flowmeter allows to change the flow which passes through the
filter. The fluid
pressure is obtained by means of the gravity, because the feeding tank is placed in high. The pressure is measured by a manomet
The filter cartridge is easily removable, so it allows to study the difference between different media, both in compositions an
d in mesh.
This unit, in addition to students teaching and training, also can be used in routine control at water purification works, or a
t water treatment works
which employ tertiary filtration.