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[[File:HydrodynamicSeparatorsPage smallpic.jpg|thumb|400px|An exampel of what a typical Oil-Grit Seperator (OGS) pretreatment device looks liked (3P Technik UK Ltd, n.d.)<ref>3P Technik UK Ltd. n.d. HYDROSYSTEM1000 SUDS MULTI-PROCESS TREATMENT DEVICE. Stormwater Treatment. Accessed September 23 2022. https://www.3ptechnik.co.uk/stormwater-treatment/hydrosystem_1000/</ref>]]

[[File:Maxresdefault.jpg|thumb|700px|A plan view example of what an Oil-Grit Separator (OGS) pretreatment device looks liked. The tapering cylinder chamber creates a "vortex swirling effect", which allows sedimentation to take place a deposits particles at the bottom of the chamber, the flow breaker grate also aids in sedimentation of suspended particles to to settle at the bottom of the sludge chamber to later be cleaned by maintenance staff (3P Technik UK Ltd, n.d.)<ref>3P Technik UK Ltd. n.d. HYDROSHARK – ADVANCED HYDRODYNAMIC PARTICLE SEPARATOR. Stormwater Treatment. Accessed September 20 2023. https://www.3ptechnik.co.uk/stormwater-treatment/hydroshark-particle-separator//</ref>]]

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