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Off grid

Off grid, the standalone OSMOSUN® plants operate from sunrise to sunset, supplying fresh water at an unprecedented low cost even in highly remote locations.

Grid-tied system

As a grid-tied system, the OSMOSUN® installation may produce water 24-7 with smart energy management coordinated with the power utility.

Osmosun® SW

Sea water solar powered desalination

Modular, the PV-SWRO units OSMOSUN® SW adapt to the water needs of the most remote water-stressed areas, to produce between 1 m3 and 15 000 m3per day from seawater.

From the raw water intake to the concentrate management, all stages of an OSMOSUN® project are designed on the basis of Mascara’s expertise to be perfectly adapted to your local context, to minimize the environmental impact and to optimize its cost.

How does OSMOSUN® work?

  • Raw Water Intake

    The quality and stability of the water feed from its natural environment will be a key element of the durability of the installation.

  • Pre-Treatment

    All the equipment (pre-treatment, OSMOSUN reverse osmosis unit and post treatment) must be integrated in a building or container(s).

  • Distribution

    The distribution and discharge of the brine are to be designed according to local standards.

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Our references

Rodrigues Island
Mauritius Island

Installation OSMOSUN® 2,6 SW

The OSMOSUN® unit, produces 20 m3 per day powered only by solar energy, without batteries, and up to 60 m3 in hybrid mode, connected to a network during periods of high demand for drinking water.

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Production capacity and main features

Unit type Daily capacity
Hybrid (Solar + Grid)
Solar surface
OSMOSUN® 0.12 SW 3 7
OSMOSUN® 1.3 SW 30 75
OSMOSUN® 2.6 SW 60 150
OSMOSUN® 7 SW 150 240
OSMOSUN® 13 SW 300 470
OSMOSUN® 24 SW 550 850
OSMOSUN® 30 SW 700 1000
OSMOSUN® 43 SW 1000 1700
OSMOSUN® 86 SW 2000 3200


  • TDS sea water : 35 to 45 g/liter
  • TDS permeat : < 0,5 g/liter

**The required solar power may be modified according to the characteristics of the project

The OSMOSUN® units are modular and may be combined in different redundant production trains to reach a daily production of fresh water up to 10 000m3.

Osmosun® BW

Solar desalination of brackish water

These PV-BWRO units dedicated to brackish water produce between 10m3 and 2000 m3 per day. Modular, OSMOSUN® BW units autonomously desalinate up to 15,000 m3 per day.

The solar powered reverse osmosis desalination technology developed by Mascara NT enables brackish water treatment. Water is considered brackish when salinity is lower than sea water and yet saline. We manage brackish water, generally found undergroung and extracted through boreholes, below 15 grams of salt per liter.

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Our references


Installation OSMOSUN® 15 BW

NamWater, the national water company in Nambia, supported by the Climate Change Adaptation Fund, has selected Mascara for this brackish water desalination project located in Bethanie.  

The OSMOSUN® unit produces...

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Production capacity and main features

Unit type Daily capacity
Hybrid (Solar + Grid)
Solar surface
OSMOSUN® 0.2 BW 5 7
OSMOSUN® 1 BW 20 50
OSMOSUN® 2 BW 40 70
OSMOSUN® 3 BW 70 90
OSMOSUN® 6 BW 140 175
OSMOSUN® 15 BW 350 420
OSMOSUN® 30 BW 700 630
OSMOSUN® 50 BW 1200 1000
OSMOSUN® 75 BW 1800 1600

Brackish water

  • TDS brackish water: < 15 g/liter
  • TDS brine: depend of the water analysis
  • TDS permeate: < 0,5 g/liter

**The required solar power may be modified according to the characteristics of the project

Solar generators

The specific consumption of the OSMOSUN® units, which is among the lowest in the world at 2.5 kWh/m3 produced with water at a salinity of 35 g per liter, implies a small solar generator size.

The daily water production capacity depends on the power of the solar generator: about 0.75kWp, or 5 to 7 m2 of photovoltaic collector surface, per m3 of daily production.

The required solar power depends on the energy supply mode, either off-grid only via a solar generator, or in source hybridization with a grid power at night for example.

The surface required for a desalination plant depends on the type of solar plant chosen, which can be one of the following:

  • Ground mounted solar panels
  • Roof mounted solar panels
  • Roof mounted Solar panels (car park shading structures)
  • Floating solar panels
  • Solar greenhouses

The solar panels we supply have a 25 year warranty, and are designed to withstand the salty seaside environment. The solar generator may be built locally.