Changes

[[File:Oil-grit separator USGS 2002.png|thumb|450px|Example oil-grit separator USGS 2002 (Wikimedia commons)]]

[[File:OGS example.jpg|thumb|450px|Plan view cut out of a typical Oil-Grit Separator (OGS) pretreatment device. In this example, the cylinder chamber and weirs create a "vortex swirling effect", which promotes settling of solids in the bottom of the chamber.  In most OGS, there is also an oil storage chamber to capture light liquids and floatables. The accumulated sediment and debris is cleaned out regularly by maintenance professionals once the sediment in the chamber reaches the manufacturer’s recommended sediment maintenance depth or the floatables capture chamber is full.]]

Pretreatment devices may be constructed in close association association with one or more [[inlets]]. Different configurations of each exist to accommodate any design.

Pretreatment devices may be constructed in close association association with one or more [[inlets]]. Different configurations of each exist to accommodate any design.

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