Precon’s Rainwater Management Oil/Grit Separator (RWM OGS) unit is an important and effective total pollutant treatment component of a stormwater management program and is approved in every major jurisdiction in Alberta. The structure features a non-blocking, indirect screening technique to treat stormwater runoff. It is highly effective in the capture of suspended solids (fine sands and larger particles), hydrocarbons, and floatable trash larger than 2.4mm. Units do not require differential head between inlet and outlet and can accommodate multiple inlets at almost any angle.