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Simple and low-tech water filtration technology that does not require electricity nor the use of chemicals

February 2023


Simple and low-tech water filtration technology that does not require electricity nor the use of chemicals

  • World Alliance Member
  • Featured Solution
  • Labeled Solution
Label Date February 7, 2023
From Switzerland
Maturity stage TRL 9 / CRI 5-6 - Market competition driving widespread deployment &/"Bankable" grade asset class

The Solution is a simple and low-tech water filtration technology that does not require electricity or the use of chemicals for the production of safe drinking water in remote locations. The solution emits less CO2 than commonly used alternatives for water treatment and preserves the environment using recyclable materials and no electricity. It is engineered and conceived as a self-inclusive system, delivered in a high quality and ready-to-use PEHD-chamber. The kls filter technology does not require electricity or the use of chemicals, which reduces CO2 emissions (compared with mainstream alternative for water treatment) and prevents environmental contamination from air, water and soil. The water treatment process is also completely silent and uses only natural filter media: the kls filter is entirely prefabricated from polyethylene, a lightweight and fully recyclable material.

The Environmental Benefits

  • The results of the tests carried out to date and the data from the scientific literature show a reduction in microorganisms (bacteria, viruses, etc.) by 3-4-log (99.9 - 99.99%)
  • Turbidity (suspended solid content) removal far below 1.0 FTU in treated water (with turbidities in the raw water of 100 FTU) and the production of microbial safe drinking water without the use of chemicals and electricity.
  • In more recently conducted R&D work using bauxite instead of quartz sand in one of the slow sand filter compartments, the solution showed reductions of E.Coli and Enterococcus up to 4 logs (99.99%)
  • The low weight of the filter (about 1'500 kg) allows, if necessary, its transport by helicopter in inaccessible areas

The Financial Benefits

  • More than 4 times cheaper than the mainstream alternative for a lifetime of 50 years without degrading water quality thanks to the use of a low-tech technology
  • Refunded after 12 years of mainstream alternative (UV-lamp) use thanks to a robust and low-maintenance technology
  • Almost 4'000$ saved per year using KLS-filters technology compared with the use of the mainstream alternative



Activity Region

  • Headquarters
  • Activity

Company Profile

RWB Groupe SA

Active since 1938, RWB employs 200 people who create and manage projects for public authorities.

Headquarters 2900 Porrentruy, Suisse
Type Company
View company profile Solution website

Networking Partner


As an expert for the innovation scene in energy and environmental technologies, CleantechAlps (Sion, Switzerland) is a hub for the cleantech ecosystem, connecting its stakeholders with relevant partners.

Solutions Associated 65
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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 RWB Groupe SA 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.