Double-pass RO

Reverse Osmosis can remove more than 98% of the dissolved salts, particles, organics, bacteria, and pyrogens from the feedwater.

Double-pass RO can supply water qualities with conductivities below 2 µS/cm by treating the permeate water from the first RO in a second RO. It also functions as a hygienic barrier against penetration of germs and bacteria in accordance with the US pharmacopoeia.


  • Energy-efficient E-pumps
  • Low-energy membranes
  • No use of chemicals
  • High-quality components
  • Minimal maintenance

Single pass reverse osmosis system in stainless steel

Product overview

Our product range comprises a number of pre-engineered double-pass RO plants with a flow rate up to 3.2 m3/h. The starting point is our modular-built standard system ensuring high flexibility, high reliability in operation, and short delivery time. All plants consist of selected high-quality components and intelligent features, e.g. Grundfos E-pumps that help reduce energy.

Each solution can be customized and built according to the specific application by adapting the choice of material, instrumentation, and control system - based on our combined know-how.


Contact your local sales and service office for more information and request of data sheets and instructions. 

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Double pass RO B1 from Eurowater

Flow up to 1.08 m3/h

Pressure vessel:Stainless steel
Pipe system:PVC
Product type:DPRO B1
Double pass RO B2 from Eurowater

Flow up to 3.2 m3/h

Pressure vessel:Stainless steel
Pipe system:PVC
Product type:DPRO B2


Flow rate up to 25 m3/h

Pressure vessel: Steel coated with polyethylene
Membranes: 8" 
Type: DPRO C4

With a customized double-pass reverse osmosis plant, it is possible to attain a flow rate up to 25 m3/h. The plant is engineered according to the same design principles as our standard plants but customized to fit your specific needs. 

The picture shows 3 x DPRO C4 providing demineralized water with low conductivity for Combined Cycle Gas Turbines.  

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Selected references using double-pass RO

Let's talk water

Selection of unit depends on application, water quality, and water consumption. We are at your service to ensure the optimum solution based on our combined know-how.

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