A Pleated
Filter Cartridge has a very thin cross-section and retains oversized particles
on the upstream side of the media. Pleated 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 pleated 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 have some depth characteristics
aiding particle retention.