MSS series feed pump

Multistage centrifugal high-pressure feed pumps that provide a new level of reliability and efficiency in seawater reverse osmosis pumps

Quote for new equipment

Quote for parts or replacement

Quote for new equipment


Quote for parts or replacement


Looking for higher flow rates?

The MSD Series High-Pressure Pump is the successor product to the MSS, with 80-87% transfer efficiency for flow rates of 40 m3/hr to 1,080 m3/hr.

Learn more about the MSD







Flow rate (m3/hr) 7.5 - 295 40 - 1,080
Maximum efficiency 80% 87%
Material of construction 316 SS Super Duplex


  • RO Feed, Booster or Circulation Pump
  • Any High Pressure Clean-Fluid Application


  • 7.5 – 250 m3/h (33 – 1100 gpm)
  • Pressures to 83 bar (1200 psi)
  • 316 SS Pressure Containment
  • Impeller and Diffuser are 316 SS – electropolished & passivated


  • Balanced Impellers
  • Simple Installation and Maintenance
  • No Oil or Grease Lubricant Required

MSS pumps are multistage centrifugal feed pumps specifically designed for brackish and seawater reverse osmosis service, representing the most reliable high-pressure feed pump available today.

Loaded with unique features such as the patented Water Bearing™  thrust bearing, product-lubricated shaft bearings, and maintenance-free design, the MSS ensures years of trouble-free operation. The MSS also features one of the longest warranties in the industry – a full 18 months of coverage from the date of product installation.
MSS pump with labels

  1. Shaft seal operates at low pressure
  2. Flexible disc coupling
  3. 316 SS shell support bracket
  4. Bearing drain line (low pressure)
  5. Precision leveling foot
  6. Grooved end pipe joints
  7. Duplex SS 2205 housing
  8. 316L SS stages – passivated & electropolished – proven in hundreds of SWRO applications
  9. Flanged construction for easy internal inspection
  10. Inlet rotatable in 90° increments
  11. Easy shaft alignment
  12. Integrated motor adapter (anodized aluminum alloy)

High Inlet Pressure Option

All MSS pumps can be equipped with high inlet pressure option to allow inlet pressure to 70 bar.
This unique design features:

    • Use of low-cost, standard mechanical seals, operating at a low pressure (typically 1-2 bars)
    • Total protection of the motor from pump thrust loads – a major problem with high inlet pressure operation
    • Pump shaft kept in tension – no potential for shaft buckling
    • Handles total axial thrust – no load on motor bearings
    • Never needs lubrication
    • Bearing cooled by feed water – no ambient temperature limit
    • 316L SS stages, passivated and electropolished

      MSS HPSC fade



Please contact Customer Service for Manuals and Drawings.


Click image to view brochure



You might also be interested in:
  • HPB Turbo – Energy Recovery Turbo can be paired with the MSS for added pressure and efficiency
  • MSD Series Feed pumps – Super Duplex construction with exceptional efficiency and flows to 850 m3/h
  • BiTurboTM – Optimized two-stage SWRO technology

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...

Read More »

MSMT - A Significant Process Improvement for SWRO

Executive Summary Seawater reverse osmosis systems (SWRO) are the mainstay of large-scale desalination systems. Plant designs have settled in a more...

Read More »

FEDCO’s BiTurbo™ SWRO in Rancho San Lucas shortlisted as Desalination Plant of the Year

Vote for Rancho San Lucas for Global Water Award 2020! We are excited to announce that the BiTurbo™ seawater reverse osmosis plant in Rancho San...

Read More »
Get a Quote