Cartridge Filters
Depth Filtration Product Guide
What is Depth Filtration?
Depth filtration, as it suggests, is the process of filtering
through a depth of media. To obtain retention of particles in
the depth media, two events occur known as mechanical and adsorbtive
retention.
Mechanical retention
is when a particle is physically restricted by means of interception,
sieving or bridging.
Adsorptive retention
refers to the adhesion of particles to the filter media. This
phenomenon occurs due to the electrokinetic properties and hydrophobic
characteristics of fibres; also known as Van der Waals force
or electrostatic force.
In general, depth filters are manufactured with a relatively
thick media that requires the fluid to travel through a tortuous
path as it proceeds from the upstream surface of the filter to
the downstream surface. As the fluid twists and turns during
its journey, decreasing sizes of all particles become trapped
and adsorbed as the matrix of fibres becomes tighter.
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