'What is Surface Filtration'?
As the name implies, a surface filter has
a very thin cross-section and retains oversize
particles on the upstream side of the media.
Surface filters are particularly suited
to removing rigid, irregularly shaped particles.
These particles accumulate with time and
form a 'cake' across the filter pores, but
still allow flow through the filter.
Descriptions of depth filters and surface
filters usually emphasize the extreme characteristics
of each. In reality, the filtration process
is somewhere on a scale between the two,
leaning predominantly to one end or the
other.
Much of the pleated media used in cartridge
filters has some depth characteristics aiding
particle retention.
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