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Grey water recycling for collective housings

September 2019
Gallery FGWRS 1
Gallery FGWRS 1


FGWRS stands for a Firmus Grey Water Recycling System

FGWRS helps preserving drinking water resources within a genuine circular system that both recycles greywater and saves energy. The system works thanks to membranes processes and technologies that allow to treat greywaters as soon as they are collected. The FGWRS® recycles more than 80% of grey waters that can be reused in showers, washing basins and many other water device of a housing. Coupled to an energy recovery system, it can recover 70% of grey water energy (presents within grey waters calories). Fully automated, the FGWRS® can be remotely followed up and controlled. Mainly intended for collective housings with significant amount of grey water but also adaptable in its domestic version for individual housing.

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Label Date September 4, 2019
From Monaco
Maturity stage Prototype testing in the real world
Looking For Visibility and an awareness by the authorities

Implementation Stories

Implemented by GL Events Live Sports & Entertainment in Paris (France) in 2020

GL Events Live Sports & Entertainment, installed a temporary FGRWS system at the Jean Bouin sports center for the 2020 edition of Roland Garros. As a pioneer in the temporary use of such an innovation during an event, and thanks to a prefectural authorization obtained specifically for the event, it was the first time that a system preserving water and energy resources was installed in their facility.


During the three-week tournament, fgwrs⊙s home station was able to save more than 23 m3 of drinkable water and recovered more than 50% of the thermal energy contained in the recycled waters, before being sent to the toilet flush


The environmental benefits

  • Recycling 80% of grey water, thus saving more than 50% of the drinking water consumed in a home

The Financial benefits

  • As a reference, for a hotel with 178 rooms and 50,000 nights/year : FGWRS will save €36'000 on the water bill and €15'000 for electricity

Activity Region

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Company Profile


FGWRS enables you to recycle 80% of your grey water.

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator FGWRS has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.