Drinking water treatments

Design, implementation and operation of purification systems to remove salts and pollutants from the surface, underground, brackish and seawater.


According to the required degree of purity, Salher designs and manufactures pre-mounted water purification and disinfection systems, ready to operate (plug & play) modular, expandable and containerizable.

In this area, Salher covers the following fields:

  • Drinking water suitable for human consumption,
  • Food industry,
  • Pharmaceutical industry,
  • Cosmetic industry,
  • Energy sector,
  • Hospital sector,
  • Chemical industry.

Compact and mobile water purification plants

Salher compact water treatment plants or WPP provide drinking water for populations up to 15.000 inhabitants everywhere, and remote areas.

Compact water treatment plants with extensive modularity.

Salher develops optimized treatment lines for flows up to 2400m³/day:

  • Small and medium populations.
  • Continuous emergency situations.
  • Immediate emergency situations.

Designed in container or compact structures to optimize the available space, these drinking water treatment plants have modular design and they are easy to extend for future needs.

Auxiliary equipment for water purification plant.

Salher includes auxiliary equipment to provide a global solution and ensures the total efficiency of the plant:

  • GPRF water storage tanks up to 150.000 liters for raw water, treated water and rejected water.
  • Container or transport shed prepared for extreme environment.
  • High pressure pumps for reliable supply of treated water.

Desalination plants

Salher designs reverse osmosis (RO) plants to treat brackish and seawater whose salt concentration exceeds 20 meq/l (1000 μS/cm).


Reverse Osmosis treatment plants remove:

  • Ions (efficiency >99%),
  • Nitrates, ammonium (80-90%),
  • Boron (50-60%),
  • Bacteria and pathogens virus.

Levels of salinity lower than 20 meq/l, such as surface and well water, Salher® suggests ion exchange technology.

Advanced pre-treatments of reverse osmosis

We recommend installing pretreatment equipment to remove suspended solids, algae, sediments, etc. A right pretreatment allows optimizing the WPP design and maximizes its useful life and reduces the operation costs (capex).

Dissolved air flotation (DAF).

Treatment for water with high turbidity through compact equipment with large lamellar surface.

Lamellar settling.

Treatment for water with high turbidity through compact equipment with large lamellar surface.


Filtration of several types and with different filtration ranges. Complete suspended solids and waste removal which can modify the efficiency of RO membrane.

  • Disc filter,
  • Multimedia filter,
  • Microfiltration,
  • Ultrafiltration,
  • Nanofiltration.

Chlorine reducer treatment (Dechlorination).

Physical removal through active carbon filter. Chemical removal through sodium bisulphate dosage to prevent membranes from being damaged.

Anti-fouling treatment.

Effective way to prevent the precipitation of the calcium phosphate and the calcium carbonate over the RO membranes.

Post-treatment systems

Salher offers a range of specific treatments for the treated water conditioning according to required quality and the final use of the water.


  • Final disinfection equipment through automatic control of pH system and water chlorination of water treated on tank.
  • Remineralization system of the treated water for human consumption.

Water purification plants control and monitoring systems


  • Production of the control panels, programming of automata (PLC) and supervision through SCADA of the treatment line efficiency.

    For further information, please refer to:  “Water treatment plant control panel”.

WPP maintenance systems

All the compact water purification plants branded Salher have the required cleaning systems to allow a complete automation of the plant and minimum impact on the equipment characteristics (filters and membranes) and pressure operation over time. 

Flushing and chemical cleaning (CIP).

When water arriving to the membranes contains substances such as metallic oxide, aluminium silicate, organic matter, colloidal particles, microorganisms and other less common pollutants, dirtiness occurs. The specific washing of the membranes keeps its properties in order to avoid the load loss and the flow decrease during its useful life.

Compact plant for above-ground water and well water.

Disinfection system.

Compact purification plant.


Salher Products

Designed and developed to meet all the requirements in water treatments.



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+34 91 870 00 15

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Engineering – Wastewater treatment – Purification – Liquid/solids separation equipment for industrial and municipal process applications – Surface water – Groundwater – Water Reuse – Drinking Water – Hydrocarbon and Oil Water Separation

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