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The majority of the specific filter media discussed so far in this Section have been porous materials, usually continuous in original format, with an intrinsic porosity consequent upon their method of original manufacture. Somewhat like the assembled bar types of media described in Section 2D, there is a very useful group of filter elements that are made up from individual pieces that, in themselves, have nofiltration capability but, when appropriately assembled into a cartridge element, can prove very effective as filters and strainers.

In many of these types of filter, as assembled, they present a filtering surface at the outer face of a cylinder, with the method of assembly having created a series of apertures of controllable width. Filtration occurs very largely at this outer face,
which can thus be considered as pure surface filtration. It also allows easy cleaning by the passage over this outer face of a brush or scraper, to remove collected dirt, and this can be done with the filter closed off from the fluid flow, or while filtration
is actually occurring (thus making an automatic strainer).

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