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Ray Barrett
Product Manager

Internalift Enclosed Screw Pumps

Most efficient and reliable means of lifting large flows of liquid or liquid-solid mixtures with odors and splashing contained.
Internalift®​ Screw Pumps from Evoqua are an excellent solution for lifting water, wastewater, and other liquids in a variety of municipal and industrial applications. They provide pump efficiencies as high as 85% and a volumetric efficiency of virtually 100%.

Evoqua is the most comprehensive source for maintaining screw pumps. Evoqua has the ability to repair, inspect, and provide complete turnkey replacement. Our product and field service experts are ready to respond.



The Internalift® or Archimedes style screw pump is a simple mechanical device consisting of a partially or fully enclosed cylinder with a continuous screw extending the length of the cylinder, thus forming lifting chambers. By placing the lower end in water and revolving the screw, water is raised to the top. Applications include: 

  • Simple, high efficient pumping solution for moving water or wastewater in the headworks of a plant
  • Recycle applications
  • Flood control applications
  • Oily water applications
  • Vapor control
  • Fish-friendly applications
  • Low footprint applications with up to 45 degree inclination available

 key benefits

  • Low installation and operating costs
  • Minimizes power costs
  • Simple operation and reduced maintenance at a constant speed
  • Hard debris is flushed through
  • Odors and splashing contained

 High Quality Fabrication and Manufacturing Expertise


  • Easily handles grit and larger solids with no upstream prescreening, grinding, or grit removal required
  • Operates at a high efficiency (85%) and virtually 100% volumetric efficient
  • At lower incoming water levels, the Internalift Screw Pump pumps less water, and with higher incoming water levels it pumps more water. This inherent self-regulating feature enables the pump to run with simple controls and at relatively low speeds – from 30 to 80 rpm – and extend bearing life.
  • 38° and 45° installation angles Internalift Enclosed Screw Pumps