Hydrodynamic Separators are great choices for in-line first flush filtration.

Swirl Chamber inside Manhole

Swirl Chamber inside Manhole

Flow-through Stormwater treatment systems that are designed to filter out trash, debris and sediment can be effective ways to meet Water Quality Volume requirements. Through a combination of baffles and swirl chamber technologies, these systems can treat large flows in a single manhole chamber. Typical types of hydrodynamic separators consist of modified concrete manhole structures, but lightweight high-performance plastic structures are also available.