Choose The Right Wastewater Pump For Your Project

Wastewater pumps are a class of pumps that are designed to handle solids-laden wastewater, effluent and sewage. Wastewater pumps are used for pumping at sewage treatment plants, industrial wastewater treatment plants, pumping septic tanks, rainwater pits along roads and for pumping grey wastewater with or without solids.

Super T Series Gorman-Rupp self-priming pump

Super T Series
Superior solids handling capability

Gorman-Rupp Super T Eradicator pumpm with superior solids handling

Super T Series with Eradicator
Superior solids handling capability

Super T Series with Eradicator Plus
Superior solids handling capability

Ultra V Series
Self-priming Pump

About Wastewater Pumps

For wastewater pumps, the presence of all manner of foreign materials such as cans, bottles, rags, wet wipes, hair and other stringy materials provide a difficult challenge. For operators, there are many dangers. Working at heights, working over water, working with heavy swinging weights, and working with cranes just to name a few.

Different styles of wastewater pumps are applied to the pumping of raw sewage, with the most common being the submersible pump. There are numerous brands and several good quality manufacturers, but all have basically the same set-up. They are suspended [lowered and raised] by rated lifting chains and are set on guide rails to enable them to engage with a permanently installed discharge bend inside the wet well.

The submersible style of wastewater pumps (shown below) have been the industry standard for several decades. As the cost of implementing safety systems and controls increases, considerations for more sustainable long term solutions that offer not only more reliable pumping capabilities with longer-lasting parts, but are additionally much safer to troubleshoot and maintain.

Ready to build the perfect wastewater pump or wastewater pump station system for your project? We’re standing by to help.

Selecting The Right Wastewater Pump

Wastewater Pumps are built to do the dirty work.
When selecting a wastewater pump there are important factors to keep in mind. Factors such as the flow, total dynamic head, available power, type of solids expected in the flow, the personnel that will be available for servicing, the suction lift [if contemplating a self-priming pump].

Gorman-Rupp sets the industry standard for wastewater pump systems and even for Wastewater pump stations including pumps, motors and controls (complete sewage pump stations). The solids-handling self-priming sewage pumps offer maximum dependability and ease of service.

When you choose a Gorman-Rupp for your pumping applications, you’ll experience some of the lowest lifecycle costs in the industry and benefit from minimal service interruptions.

The Advantages Of Above Ground Gorman-Rupp Pump Vs Submersible Pumps (Video)

O.H & S Reasons, Gorman-Rupp Wastewater Pumps are a better choice:

  • Wet well lids remain closed
  • All equipment accessed at ground level
  • No working over water
  • No working at heights
  • No working with cranes
  • No working with heavy swinging weights
  • 99% of maintenance can be done safely by one person


If you have selected a self-priming pump for safety reasons, make sure your self-priming pump offers its operators the right levelof protection. The better self-priming pumps will have some or all of the following safety features:

– A priming fill port is retained by a clamp bar with a finely threaded screw, and the cover plate sealed with a Teflon gasket. This isimportant because if operators attempt to open the port while the pump is pressurised, pressure is released horizontally, notvertically.
– The better self-priming pumps will have a shielded fill port cover.

–  A good quality pressure relief valve to vent excessive pressure from the casing if the pump is accidentally operated against aclosed head [and your pump supplier should know the pressure these valves will start to “vent”]

–  A non-return suction flap valve with a safety burst disc centre to vent excessive pressure in case of a water hammer spike.

– The pump should have external adjustment of the internal impeller/wear plate clearances, and for convenience and safety,operators should be able to do this from the non-drive side of the pump.


It is very easy to think that all self-priming pumps will have the same features, because they look the same, have the same shape,and are marketed as “equivalent”. But appearances can be very deceiving. A good quality self-priming pump will have some or allof the following maintenance features:

–  Good self-priming pumps will have shim-less adjustable clearances. The better ones will have their adjustment systems on the suction side of the pump [away from the drive end, to make it easier and safer for operators]. The best ones will have their clearance settings easy to index and lockable so that they remain in place during other maintenance events.

– Good self-priming pumps will have at least 3mm of wear built into the impeller/ wear plate clearance system.The best pumps
will have up to 6mm of wear built into their clearance adjustment system.

– A good self-priming wastewater pump will have a replaceable suction flap valve that can be accessed for cleaning and/or replacing without the need for disconnecting suction piping. The best ones will enable access to the flap valve without the need to open the pump.

– Good quality self-priming pumps will be able to pass solids [in sizes as advertised on curves and data sheets] through all internal passages inside the pump. Not only the impeller, but advertised solids size spheres should be able to pass through the recirculation port, discharge nozzle and all other passages. Quality manufacturers can guarantee this and even have certified drawings to support this claim.

–The better self-priming pumps will have the pusher-bolt capability on both the cover-plate and rotating assembly to make it easier for operators to remove these items for service even if they’ve been operating for “years” without being removed.

– Non-clogging/blocking ability is a very important feature if operator intervention is to be kept to a minimum. Besides having through-let sizes big enough to pass published sphere sizes, pumps need to be able to handle stringy materials such as rags. Pumps with standard wear plates will not measure up in this area. Only select pumps with “self-cleaning” wear plates or withspecialist rag handling systems like Gorman-Rupp’s “Eradicator Solids Management System™”.

Having the right safety and maintenance features is extremely important, but pumps need to be able to deliver the required serviceand have the required aftermarket support.


Safety and maintenance features are very important, but so is delivering the right flow and pressure for a given application. The pump also needs to have a Net Positive Suction Head Required [NPSHr] that is lower than the NPSH available. These are all aspects of the pump selection that need to be considered by the pump supplier. The chosen wastewater pump manufacturers literature in this area, therefore, needs to be trusted. The market leaders in self-priming pump technology have years of R&D put into the development of pump curves and NPSHr curves, so can be trusted to provide pumps that will deliver published performance. Getting references from other Water Authorities or Councils is a good approach in determining those brands that can be trusted to deliver on performance.

Long service life is also an important factor in determining the right pump. Pumps that are safe and easy to work on are an excellent start. Pumps that have features that protect the pump as it operates year in-year out will deliver the desired asset longevity. Features like a double lip seal and atmospheric vent protecting the bearings and shaft will add years to the replacement intervals for these parts. Anti-rotation ribs in the seal area will also add to mechanical seal life by slowing velocities down within the seal area.

“After Market” performance is also a measure of a good supplier. Parts and replacement pumps should be readily available for ex-stock delivery. An unsupported wastewater pump is a poor investment.

Here at Hydro Innovations, we hold a very large inventory of pumps and spare parts that allows us to deliver industry-leading service.With over 80 years of combined experience in applying, selecting and troubleshooting pumps, we are experts at designing the most successful and cost-effective fluid transfer systems to meet your requirements. Call us now on (02) 9898 1800, email here (email or use the form below to find out more information about your pumping needs.

Gorman-Rupp above ground self-priming pump station

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Gorman-Rupp Pump Videos

Over 50 Years of Wastewater Pump Stations

Introduction & Safety Video

Back Cover Removal

Back Cover & Removal

Suction Check Valve Removal

Rotating Assembly Removal

Our expert team is standing by for any questions you have about how best to configure your pump system.

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Our Team is available to answer your pump query within the hour

Hydro’s experts are standing by to help you get the best pump, aerators and genuine spare parts for your specific project.


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(02) 9898 1800

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Hydro Innovations is proud to distribute a broad range of quality, reliable and industry-leading industrial pumps and aerators.

Gorman-Rupp is the world leader in self-priming centrifugal wastewater pump technology, and invests heavily in R&D, and in training for their international representatives – like Hydro Innovations.

This puts us in an excellent position to make the very best recommendations for our Australian customers.

Our other suppliers, Ragazzini of Italy and EDUR of Germany, are also world leaders in their respective technologies (Peristaltic Pumps – Ragazzini, and Specialist centrifugal pumps – EDUR).

We carry a very large inventory of pumps and spare parts for all of these brands, to help us to deliver industry-leading service.

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