PWTech Volute ES302 Running at Full Operational Speed - Video
This ES302 Volute Dewatering Press from PWTech uses precision cut stainless steel rings throughout the entire dewatering drum. As seen here, half of the rings are allowed to move with the screw's slow but constant rotation, while the other half are fixed in place. The combination of fixed and moving rings produces a self-cleaning screen that is practically impossible to clog or bind up, and allows the Volute to deliver high throughput in a compact footprint.
The clear filtrate you can see pouring out of the thickening zone of the dewatering drum is typical for the Volute.