How does the Water-to-Water technology work?

With the help of a membrane distillation process, water is evaporated under low pressure through a heat pump condensation process. The vapor produced by heating the water then passes through the membrane.

Unlike reverse osmosis, where water with dissolved salts and other solids passes through the membrane, this membrane only allows water vapor to pass through.

The pores in this membrane are also larger than the pores in reverse osmosis membranes, which means that less pressure and energy is required.

The driving force of this technology is the partial pressure difference (temperature difference) between each side of the membrane pores.

The Water-to-Water system can be efficiently driven by wind, sun, grid, generator or combinations of these items.

This allows water to be produced close to where it also can be used, so transportation and distribution costs are eliminated.

Water-to-Water units are available in 3 versions and produce 37.500, 75.000 or 150.000 drinking water per day.



Funded by the European Commission

The Water-to-Water (W2W) project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 873854. You can find more information on the website of the European Union.

Water-to-Water features:

  • Produceert drinkwater uit zeewater, brak of besmet water
  • Up to 37,500, 75,000 or 150,000 liters of drinking water per day per machine
  • Multiple units can be combined for larger projects
  • Choice of power sources: wind, solar, grid, generator or hybrid combinations
  • For wind force, wind speed of 3 - 18 meters per second (6.7 - 40 miles per hour)

Where can the Water-to-Water be used?

  • Communities with insufficient or no access to a freshwater source or reliable energy source, but close to a significant supply of seawater or polluted water
  • Companies that are looking for energy-efficient technology to clean and possibly reuse wastewater
  • Cities or regional governments that restore rivers, lakes and ports

The Water-to-Water can be powered by various energy sources, including a windmill. Watch in our product video how the technology behind it works.