The PISTA® Vio Grit Removal System provides unprecedented application flexibility and superior grit removal efficiency with a design that allows for full variability of the inlet and outlet chambers.

PISTA® Vio features a hydraulic vortex grit chamber design that utilizes a a ring and tunnel system to create the vortex flow pattern that facilitates grit removal, rather than a baffle system typical of other vortex systems.

This type of grit removal system - one of the first of its kind in the industry provides the ability to design the inlet and outlet channels at any variable angle up to the full 360° of the chamber. Designers can flexibly arrange the system to fit existing sites, or maximize space during construction on new sites.

The ring and tunnel system, in addition to providing application flexibility, also offers superior grit removal efficiencies. A ring attached to the chamber wall promotes the vortex flow pattern and separates the inlet and outlet paths, minimizing grit bypass. Influent flow is assisted through a tunnel that directs it towards the flat chamber floor for removal of grit.

) Influent Flume Directs the flow toward the wall of the chamber to promote vortex movement and the necessary velocities.

2) Underdrive Supports influent flow velocity, especially helpful in low flow applications.

3) Axial-flow Propellers Redesigned axial-flow propellers have been improved to create better lift in the deeper chamber.

4) Effluent Flume Designed to minimize the harmful weir effect that can contribute to grit  in these types of systems.