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  • Product specifications: the HPB turbocharger and MSS high pressure pump are perfectly suited to low pressure RO applications.
  • Case study: Addressing variable feed quality using interstage boosting.
  • Technical paper: Collaboration with Biwater to deliver energy recovery designs for San Diego's Pure Water Project.

    Brackish & Wastewater Reverse Osmosis

    • Minimize downtime and operating costs 
    • Balance system flux 
    • Guarantee optimal system performance
    Browse low-pressure RO equipment

    Minimize operating costs and energy consumption.

    Interstage turbochargers
    Motorized turbochargers
    HPB-500 V1.8 (1)
    HPB-500 HEMI-300 height

    Eliminate interstage pumps and balance system flux.

    Fine-tuned boosting for large-scale brackish water RO.

    RO-Interstage Boost

    A two-stage reverse osmosis system equipped with a turbocharger for interstage boosting. This balances system flux and optimizes membrane performance. 

    Brackish water reverse osmosis (Florida, USA)
    Florida, USA: interstage boosting for brackish water reverse osmosis
    Changi NEWater Plant
    Changi, Singapore: Feed boosting for water recycling
    Orange County Water Recycling
    Orange County, USA: Feed boosting for water recycling
    We are constructing more desalination capacity than ever, but traditional single-stage membrane arrays dominate
    Small increases to recovery come at the cost of higher biofouling, higher chemical consumption and shorter membrane life
    Large arrays of isobaric ERDs also struggle to maintain consistent energy transfer, and introduce brine-feed mixing
    • Increase permeate production
    • Maintain optimal membrane conditions
    • Ensure smooth operation with variable feed quality
    • Lower energy consumption
    • Minimize plant footprint
    • Reduce brine discharge volume
    High pressure pumps

    FEDCO high pressure centrifugal pumps are used in thousands of installations, including some of the world's largest BWRO and wastewater reuse facilities, such as the Orange County's Groundwater Replenishment Scheme and Singapore's Changi NEWater Facility.

    Our pumps are recognized for their high efficiency, efficient delivery and unparalleled reliability in the field. The table below summarizes the operating envelope for the MSS Series and MSD Series high pressure feed pumps. For lower pressure BWRO systems (up to 19 bar/270 psi) and for general service/pretreatment applications, we recommend using the SLP Series low pressure pump.

    Pump Model

    MSS Series 

    MSD Series

    Minimum flowrate

    7.5 m3/hr

    33 gpm

    40 m3/hr

    1,080 gpm

    Maximum flowrate

    250 m3/hr

    1,100 gpm

    1,080 m3/hr

    4,755 gpm

    Maximum efficiency



    Materials of Construction

    316 SS

    Super Duplex (Zeron-100)

    Product specifications




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    Interstage boosting

    Interstage boosting is commonly used in brackish water reverse osmosis (BWRO) to balance flux between multiple RO stages. This achieves more stable membrane performance and higher recovery rates.

    Using a turbocharger for your system's interstage boosting needs avoids using additional energy, and saves CAPEX on a booster pump, motor and variable frequency drive. It is also highly compact and operates with close to zero noise and vibration.


    Interstage boosting is an ideal solution to handling high recovery applications or variable feedwater quality. See the case study below to find out more.

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    Contact our sales team to find out more about our products and services.

    Motorized turbochargers

    The HP-HEMI is the latest generation of energy recovery device technology for large-scale reverse osmosis, consisting of a FEDCO HPB model turbocharger coupled to a motor. Unlike unlike a conventional turbocharger, the impeller driving the feed boost can be powered by a combination of hydraulic and electrical energy.

    The HP-HEMI has three modes of operation:

    • Passive: the motor is disengaged, and the feed boost powered entirely by brine energy.
    • Motor-assisted: If brine energy is insufficient to power the required feed boost, the motor and VFD engage to provide additional boost pressure.
    • Regenerative: If a regenerative variable frequency drive (rVFD) is used, this enables the generation of electricity when brine energy is more than required for the required feed boost.

    BiTurbo HEMI Rendering Close-up View

    Scale rendering of the largest HP-HEMI model, with a capacity of 2,800 m3/hr (12,000 gpm), consisting of a motor (left) coupled to a turbocharger ERD (right).

    Find out more:

    Contact our sales team to find out more about our products and services.

    Optimizing RO performance: The Power of Interstage Boosting

    This post is adapted from a technical paper presented by FEDCO and Biwater at the 2023 AMTA Membrane Technology Conference. Click here to read the...

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    FEDCO and Biwater deliver innovative energy recovery design

    FEDCO is proud to be working with Biwater to deliver an innovative solutions for reverse osmosis energy recovery at the San Diego North City Pure...

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    FEDCO presents optimized RO approaches at IDA World Congress, Sydney

    On October 8-11 the global desalination industry convened in Sydney for the International Desalination Association World Congress. Following delays...

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