OSMOSUN®, the world’s first reverse osmosis desalination solution using only solar energy, offers two key advantages for water stressed regions :


  • No CO2 emission in production
  • Low salinity of the concentrate


  • Thanks to the lowest OPEX on the market
  • In spite of a CAPEX higher than conventional units mostly due to the solar panel


Range of modular desalination units

The OSMOSUN® desalination units are the world’s first solar-powered units. These 100% autonomous units produce between 1 m3 and 600 m3 of fresh water per day. Modular, OSMOSUN® units adapt to the water needs of the most remote water stressed settings, to desalinate sea water to produce 1 m3 to 10 000 m3 per day of fresh water.

Seawater characteristics

TDS seawater: 35 to 45 g/liter
TDS concentrate: 45 to 50 g/liter
TDS permeate: < 0,5 g/liter

Project design

Every desalination need is specific to its environment; Mascara Renewable Water offers turnkey OSMOSUN® solar desalination installation as well as ready to install OSMOSUN® units to implement in a prepared environment.

  • The criteria when considering whether or not to customize OSMOSUN® units are multiple:
  • Potential pre-treatment depending on the raw water supply
  • Remote monitoring and maintenance of the OSMOSUN® unit
  • Post-treatment by re-mineralization (by calcification) and/or chlorination (by solar electrolysis) of the permeates
  • Containerization for transportation and/or permanent implementation

Hybrid powering of desalination units

The OSMOSUN® desalination units are flexible and modular. Thus, to generate energy outside the hours of sunshine and produce up to three times the solar daily capacity if necessary, (24hours per day instead of 8 hours), it is possible to connect the desalination units to an alternative source of energy.

When the source of electricity, network or generator is above 0.13 € / kWh, the OSMOSUN® desalination unit is more competitive than a conventional desalination unit.

The OSMOSUN® 10 unit thus produces 30m3 of water per day instead of the 10m3 of water with just the solar energy, or the OSMOSUN® 300 unit produces up to 900m3 of water per day.

This additional solar / grid hybrid power capability allows OSMOSUN® to be used as a “virtual battery,” a flexible, low-power load for an increased penetration rate of renewable energy on the grid.

Load-shedding in whole or in part : The OSMOSUN® adjusts to the power available on the grid


Range of modular desalination units

Photovoltaic desalination technology by reverse osmosis, without battery, developed by Mascara Renewable Water allows desalination of brackish water, which salinity is lower than seawater, at between 3 and 7 grams of salt / liter of water. This water is generally extracted from aquifers through drilling a borehole. These units dedicated to brackish water produce between 20m3 and 500 m3 per day of fresh drinking water. Modular, the OSMOSUN® BW units desalinate up to 5,000 m3 per day as a standalone, off grid installation.

Brackish water characteristics

TDS brackish water: 5 to 7 g/liter
TDS concentrate: depend of the water analysis
TDS permeate: < 0,5 g/liter

This unique technology has been designed for isolated areas, with a concern for maximum simplicity, and autonomy provided only by the affordable solar energy available anywhere. The characteristics of desalination units OSMOSUN®BW simplify the construction of a project with a good adaptation to the needs of remote areas:

  • Very low specific consumption
  • Desalination by solar energy is very respectful of the environment by the absence of CO2 emission
  • A conversion rate of 75%, equivalent to 75 liters of fresh water per 100 liters of water pumped.
  • Maintenance design and monitoring: OSMOSUN® units, fully automatic, guarantee 20 years of production with very low recurring costs in the most remote areas.

Hybrid powering of desalination units

The OSMOSUN® brackish water desalination units, similarly to the OSMOSUN® seawater desalination units, can also be connected to alternative sources of electricity for 24 hours production and not only during 8 to 10 hours of sunshine.

Though involving an electricity bill for night water production, the OSMOSUN® hybrid operation makes it possible to triple the daily production of the same unit,

The economic forecast will determine the relevance of the hybrid powered feature, defining which mode produced the lowest water costs.


Range of modular unsanitary water desalination units

Capitalizing on the development of the first flexible membrane desalination technology by reverse osmosis, powered by fluctuating solar energy, without battery storage, Mascara Renewable Water has developed the same equipment for the treatment of waters contaminated with fluorine or arsenic and low-brackish water by nanofiltration: the range of NANOSUN® units.

Mascara Renewable Water offers a complete range of standalone units, with production capacity between 20 and 500m3 per day per unit :

Project design

To define the technology to be used for a water treatment project, identifying the water quality to be treated and the setting’s specificities is the first crucial step.

Membrane water treatment technologies for saltwater and unsanitary water reverse osmosis and nanofiltration are close. The technological choice toward one or the other depends of the water quality to be treated and aims to optimize the production cost of drinking water:

  • For water with more than 3g of salt per liter, OSMOSUN® reverse osmosis treatment is necessary
  • For water less than 3g per liter or polluted (arsenic, fluorine) water treatment can be performed both by solar powered reverse osmosis system-OSMOSUN®, or by solar powered nanofiltration units- NANOSUN®.

The contexts of installation of salt or contaminated water treatment can vary greatly, especially between surface water and groundwater. Our technical and commercial teams are available to support you in the design of a tailored drinking water production project.

Hybrid powering of desalination units

Like the OSMOSUN® solar desalination units, the NANOSUN® solar water treatment units can also be connected to alternative sources of electricity for 24-hour production and not solely during sunshine hours. This hybrid operation mode enables to triple the daily production of the same unit but involves an electricity bill for night production. The choice of using this option is primarily defined by the economic calculations that determine the lowest water production cost.



Simple yet durable, the OSMOSUN® NOMAD water treatment units are fully equipped for pre-treatment and filtration of sea water, brackish water, or water contaminated with fluorine and/or arsenic to produce drinking water meeting the World Health Organization standards.

Stand Alone

Powered by solar energy, the cheapest source of energy in the world


Packaged to be delivered by air, land, and sea

Ready to install

Designed for rapid implementation and use on a prepared site


Adaptable to all water quality for a daily fresh water production of 1 to 160m3 per module


600 L to 1m3 of water per day

– Transportable unit base for multi-location use
– 4 hour set-up time
– Save 4L of gas per day

5 to 30m3 per day

– One 20 or 40 foot all-inclusive stationary unit
– 8 hour set-up time
– Save up to 130L of gas per day

40 to 160 m3 per day

– Two 20 or 40 foot all-inclusive stationnary unit
– 12 hour set-up time
– Save up to 500L of gas per day



Ensure one week’s worth of drinkable water


Constant remote performance evaluation and maintenance reports


Adress water consumption needs during peak hours


Water production capacity up to 1000m3/day


Mascara Renewable Water’s expertise enables the conversion of conventional desalination units into OSMOSUN® solar powered desalination units, producing 30 to 40% of its daily production using just solar energy. Mascara’s engineers are the first ones in the world offering this process optimization to dramatically reduce the cost of water.

The competitiveness of OSMOSUN® conversion of conventional desalination units is directly related to energy costs: the higher the energy cost, the better the competitiveness.

The competitiveness of the OSMOSUN® conversion is dependent on three main reasons:

  1. Most of the existing desalination installation will remain: seawater supply, buildings, prefiltration, membranes, pipes, post-treatment, brine rejection (…). The preliminary study by Mascara Renewable Water’s engineers will determine the necessary tweaks to the existing desalination unit.
  2. One third of the water production will be powered by affordable solar energy: solar energy is now the cheapest in the world, and is specifically relevant for isolated grids which previously relied on expensive fossil fuel energy sources.
  3. The specific energy consumption will decrease: the process optimization by Mascara Renewable Water will significantly decrease the energy consumption per m3 produced. OSMOSUN®’s specific energy consumption is among the lowest in the world, with 2,5kWh/m3 with water at 35g/l. The conversion in OSMOSUN® is likely to reduce the energy consumption, especially in the absence of any energy recovery device; the preliminary study will determine the extent of the reduction.


Case of a desalination unit of 300m3/day consuming 4kwh/m3 with a local kwh: USD0.30

  • One third of the daily production (100m3) is produced with solar energy,
  • Daily solar energy production of 400kwh or USD120 and more than USD40,000 OFF THE ANNUAL ENERGY BILL

Every OSMOSUN® conversion relies on a preliminary study of the current installation’s condition.



The specific consumption among the lowest in the world of the OSMOSUN® units, with 2,5kWh/m3 produced with seawater at 35g/l, implies a solar generator of limited surface.

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

The surface requested for the generator of a desalination unit installation may vary according to the selected type of solar generator. Mascara offers the following options :

Ground sensors

Rooftop solar

Solar shelters

Floating solar panels

Solar greenhouse

The solar panels we supply have a 25 year warranty, and are specifically designed to hold up against tough seaside marine environments.

The solar generator can be sourced and installed locally. Mascara handles the solar energy management, which enables a flexible functioning of the reverse osmosis desalination unit.



OSMOSUN® solar desalination units can fit many water stressed settings with sufficient solar exposure.

We have developed several tools to assist you throughout the steps of implementation of your renewable desalination project, from the dimensioning, to the economic and technical feasibility study, to :

Specifically defining your water needs to address them with the appropriate OSMOSUN® unit and taking into account the local characteristics (solar exposure…)

Demonstrating the price competitiveness vs. a conventional unit powered by a diesel generator using the software, OSMODEL, developed to study the technical and financial feasibility of your desalination projects


OSMOSUN® is competitive in price when compared to conventional desalination units that use energy recovery devices whenever the price of electricity is above .13€/kWh, which is equivalent to 0.30 € per liter of gas.

In the case of conventional desalination units that are not equipped with energy recovery devices, OSMOSUN® is also more cost effective, from as low as 0.05 € per kWh.

With a cost of kWh of 0.25 € the return on investment period, compared to conventional units, is about 4 years.

*The suggested price of water includes the depreciation of the initial investment, with a discount rate of 7%.