Modular multi-media filtration unit

A process of filtering using a multi-media modular filtration unit for separating solids from a fluid, comprising:

• passing said fluid through an influx conduit under pressure into the first of at least two filtration modules disposed in alignment for series flow within a water tight cabinet containing filter media therein, until the filter surface of said first module is clogged sufficiently to create a pressure to open a centrally located bypass pressure release valve located in a tubular opening through the filter media to allow said fluid to bypass said clogged surface and impinge on the unclogged surface of the second module having a centrally located pressure release valve therein identical to the bypass pressure release valve in said first module wherein said filter media varies in media particle size from a preceding module and varies in depth from a preceding module and contains different media from a preceding module;
• wherein said media in said first and sequential modules are sized to remove larger particles first, medium particles next, and finer particles last, in order to extend the run time of the filtering process.