#### Introduction **A leading European construction company overseeing the development of a cutting-edge [hydrogen ](/en/core-markets/hydrogen-production "Hydrogen production")fuel cell production facility in France enlisted our experts to address their specialized water needs.** To support the efficient operation of the hydrogen fuel cell plant, we have designed and implemented a comprehensive solution that incorporates four [SirionTM Advanced](/fr/technologies/sirion-advanced "Sirion™ Advanced") **reverse osmosis** units, accompanied by two Aquadem ion exchange resin cylinders, and supplemented with a microfiltration stage. Together, these components create a robust and reliable system for the production, storage, and circulation of [**ultrapure water**](/en/applications/ultrapure-water "Ultrapure water") crucial for the manufacturing process of hydrogen fuel cells, which will ultimately decarbonize public buses, taxis and trucks. [  ](https://www.veoliawatertechnologies.com/en/download-purified-water-helps-hydrogen-fuel-cell-manufacturer-decarbonize-public-transport)