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PREROSTAL®: Matched Flow and Clean Wet-Wells


A method of matching pump outflow to pump station inflow without the need for additional flow control or additional electrical equipment such as inverter drives. A highly effective sump cleaning system without the need for any additional mechanical or electrical items, such as grinders, bar screens or mixers.


Product Advantages:

  • Matches station outflow to inflow using fixed-speed motors
  • Automatically removes floating and settled solids
  • Shallower pump stations [compared to submersibles with On-Off controls]
  • Alternative to Archimedes screw pumps
  • Reduced construction costs due to prefabricated basin design

The PREROSTAL® Pre-rotation system is a unique, economical, uncomplicated method of automatically adjusting pumping volume to varying inflow rates using a constant speed motor and pump. It combines the screw centrifugal impeller characteristics of a Hidrostal pump with a specially configured vortex inducing chamber around the suction pipe of the pump. The chamber utilizes gravity to impart a fluid spin in the same direction of rotation as the pump impeller, and this spin produces a flow reduction without the necessity of changing pump speed. This method of matching pump outflow to pump station inflow eliminates the need for any electrical equipment such as inverter drives.


In addition the PREROSTAL® system is a highly effective sump cleaning system which does not require any additional items or moving parts. It is the ideal solution for handling variable flow applications with large solids.


The PRESOSTAL® system is a proven and cost effective alternative to Archimedes screw pumps or other methods that require complex controls or additional electrical/mechanical devices.

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